189897187 has 2 divisors, whose sum is σ = 189897188. Its totient is φ = 189897186.

The previous prime is 189897179. The next prime is 189897193. The reversal of 189897187 is 781798981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189897187 - 2³ = 189897179 is a prime.

It is not a weakly prime, because it can be changed into another prime (189897107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94948593 + 94948594.

It is an arithmetic number, because the mean of its divisors is an integer number (94948594).

Almost surely, 2^189897187 is an apocalyptic number.

189897187 is a deficient number, since it is larger than the sum of its proper divisors (1).

189897187 is an equidigital number, since it uses as much as digits as its factorization.

189897187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 58.

The square root of 189897187 is about 13780.3188279517. The cubic root of 189897187 is about 574.7859942104.

The spelling of 189897187 in words is "one hundred eighty-nine million, eight hundred ninety-seven thousand, one hundred eighty-seven".