18113940 has 72 divisors (see below), whose sum is σ = 59179848. Its totient is φ = 4458240.

The previous prime is 18113939. The next prime is 18113957. The reversal of 18113940 is 4931181.

It can be written as a sum of positive squares in 4 ways, for example, as 17424 + 18096516 = 132^2 + 4254^2 .

It is a super-2 number, since 2×18113940² = 656229644647200, 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 23 ways as a sum of consecutive naturals, for example, 1531 + ... + 6210.

Almost surely, 2^18113940 is an apocalyptic number.

18113940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18113940 is an abundant number, since it is smaller than the sum of its proper divisors (41065908).

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

18113940 is a wasteful number, since it uses less digits than its factorization.

18113940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7769 (or 7764 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 18113940 is about 4256.0474621414. The cubic root of 18113940 is about 262.6259531607.

The spelling of 18113940 in words is "eighteen million, one hundred thirteen thousand, nine hundred forty".