389172891 has 12 divisors (see below), whose sum is σ = 551217272. Its totient is φ = 244186368.

The previous prime is 389172887. The next prime is 389172893. The reversal of 389172891 is 198271983.

It is not a de Polignac number, because 389172891 - 2² = 389172887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 389172891.

It is not an unprimeable number, because it can be changed into a prime (389172893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223570 + ... + 225303.

Almost surely, 2^389172891 is an apocalyptic number.

389172891 is a deficient number, since it is larger than the sum of its proper divisors (162044381).

389172891 is a wasteful number, since it uses less digits than its factorization.

389172891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448910 (or 448893 counting only the distinct ones).

The product of its digits is 217728, while the sum is 48.

The square root of 389172891 is about 19727.4653972577. The cubic root of 389172891 is about 730.0974980804.

The spelling of 389172891 in words is "three hundred eighty-nine million, one hundred seventy-two thousand, eight hundred ninety-one".