18211672 has 32 divisors (see below), whose sum is σ = 35287920. Its totient is φ = 8807040.

The previous prime is 18211643. The next prime is 18211679. The reversal of 18211672 is 27611281.

It is a self number, because there is not a number n which added to its sum of digits gives 18211672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211679) 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, 32418 + ... + 32974.

Almost surely, 2^18211672 is an apocalyptic number.

It is an amenable number.

18211672 is a deficient number, since it is larger than the sum of its proper divisors (17076248).

18211672 is a wasteful number, since it uses less digits than its factorization.

18211672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 687 counting only the distinct ones).

The product of its digits is 1344, while the sum is 28.

The square root of 18211672 is about 4267.5135617828. The cubic root of 18211672 is about 263.0974304931.

The spelling of 18211672 in words is "eighteen million, two hundred eleven thousand, six hundred seventy-two".