18899964 has 18 divisors (see below), whose sum is σ = 47775000. Its totient is φ = 6299976.

The previous prime is 18899941. The next prime is 18899977. The reversal of 18899964 is 46999881.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 18899964.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 262464 + ... + 262535.

Almost surely, 2^18899964 is an apocalyptic number.

It is an amenable number.

18899964 is an abundant number, since it is smaller than the sum of its proper divisors (28875036).

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

18899964 is a wasteful number, since it uses less digits than its factorization.

18899964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525009 (or 525004 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 18899964 is about 4347.4088834615. The cubic root of 18899964 is about 266.3710313981.

The spelling of 18899964 in words is "eighteen million, eight hundred ninety-nine thousand, nine hundred sixty-four".