18965172 has 12 divisors (see below), whose sum is σ = 44252096. Its totient is φ = 6321720.

The previous prime is 18965171. The next prime is 18965203. The reversal of 18965172 is 27156981.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 18965172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18965171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790204 + ... + 790227.

Almost surely, 2^18965172 is an apocalyptic number.

18965172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18965172 is an abundant number, since it is smaller than the sum of its proper divisors (25286924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18965172 is a wasteful number, since it uses less digits than its factorization.

18965172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580438 (or 1580436 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 18965172 is about 4354.9020654890. The cubic root of 18965172 is about 266.6770211257.

The spelling of 18965172 in words is "eighteen million, nine hundred sixty-five thousand, one hundred seventy-two".