18697880 has 16 divisors (see below), whose sum is σ = 42070320. Its totient is φ = 7479136.

The previous prime is 18697849. The next prime is 18697901. The reversal of 18697880 is 8879681.

It is a super-2 number, since 2×18697880² = 699221432988800, 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 3 ways as a sum of consecutive naturals, for example, 233684 + ... + 233763.

It is an arithmetic number, because the mean of its divisors is an integer number (2629395).

Almost surely, 2^18697880 is an apocalyptic number.

18697880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18697880 is an abundant number, since it is smaller than the sum of its proper divisors (23372440).

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

18697880 is a wasteful number, since it uses less digits than its factorization.

18697880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467458 (or 467454 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 18697880 is about 4324.1045315765. The cubic root of 18697880 is about 265.4182549035.

The spelling of 18697880 in words is "eighteen million, six hundred ninety-seven thousand, eight hundred eighty".