18997308 has 48 divisors (see below), whose sum is σ = 53733120. Its totient is φ = 5756400.

The previous prime is 18997273. The next prime is 18997331. The reversal of 18997308 is 80379981.

It is a super-2 number, since 2×18997308² = 721795422493728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6808 + ... + 9183.

It is an arithmetic number, because the mean of its divisors is an integer number (1119440).

Almost surely, 2^18997308 is an apocalyptic number.

18997308 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18997308 is an abundant number, since it is smaller than the sum of its proper divisors (34735812).

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

18997308 is a wasteful number, since it uses less digits than its factorization.

18997308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16015 (or 16007 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18997308 is about 4358.5901390243. The cubic root of 18997308 is about 266.8275619309.

The spelling of 18997308 in words is "eighteen million, nine hundred ninety-seven thousand, three hundred eight".