189361989 has 8 divisors (see below), whose sum is σ = 280536320. Its totient is φ = 126241308.

The previous prime is 189361957. The next prime is 189361993. The reversal of 189361989 is 989163981.

189361989 is a `hidden beast` number, since 18 + 9 + 3 + 619 + 8 + 9 = 666.

It is not a de Polignac number, because 189361989 - 2⁵ = 189361957 is a prime.

It is a super-2 number, since 2×189361989² = 71715925756072242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189361889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3506677 + ... + 3506730.

It is an arithmetic number, because the mean of its divisors is an integer number (35067040).

Almost surely, 2^189361989 is an apocalyptic number.

It is an amenable number.

189361989 is a deficient number, since it is larger than the sum of its proper divisors (91174331).

189361989 is an equidigital number, since it uses as much as digits as its factorization.

189361989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7013416 (or 7013410 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 189361989 is about 13760.8861996603. The cubic root of 189361989 is about 574.2455021489.

The spelling of 189361989 in words is "one hundred eighty-nine million, three hundred sixty-one thousand, nine hundred eighty-nine".