189 (one hundred [and] eighty-nine) is the
natural number following
188 and preceding
190.
In mathematics
189 is a
centered cube number[1] and a
heptagonal number.[2]
The centered cube numbers are the sums of two consecutive
cubes, and 189 can be written as
sum of two cubes in two ways: 43 + 53 and 63 + (−3)3.[3] The smallest number that can be written as the sum of two positive cubes in two ways is
1729.[4]
There are 189 zeros among the decimal digits of the positive integers with at most three digits.[5]
^Longa, Patrick;
Gebotys, Catherine H. (2010). "Efficient Techniques for High-Speed Elliptic Curve Cryptography". In Mangard, Stefan; Standaert, François-Xavier (eds.). Cryptographic Hardware and Embedded Systems, CHES 2010, 12th International Workshop, Santa Barbara, CA, USA, August 17-20, 2010. Proceedings. Lecture Notes in Computer Science. Vol. 6225. Springer. pp. 80–94.
doi:10.1007/978-3-642-15031-9_6.
ISBN978-3-642-15030-2. See Appendix B.