189621187 has 16 divisors (see below), whose sum is σ = 222630912. Its totient is φ = 158114880.

The previous prime is 189621163. The next prime is 189621209. The reversal of 189621187 is 781126981.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-189621187 is a prime.

It is a super-3 number, since 3×189621187³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (189622187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132168 + ... + 133594.

It is an arithmetic number, because the mean of its divisors is an integer number (13914432).

Almost surely, 2^189621187 is an apocalyptic number.

189621187 is a deficient number, since it is larger than the sum of its proper divisors (33009725).

189621187 is a wasteful number, since it uses less digits than its factorization.

189621187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938.

The product of its digits is 48384, while the sum is 43.

The square root of 189621187 is about 13770.3009044828. The cubic root of 189621187 is about 574.5073910774.

The spelling of 189621187 in words is "one hundred eighty-nine million, six hundred twenty-one thousand, one hundred eighty-seven".