18740992 has 36 divisors (see below), whose sum is σ = 39387880. Its totient is φ = 8875008.

The previous prime is 18740941. The next prime is 18740993. The reversal of 18740992 is 29904781.

It is a super-2 number, since 2×18740992² = 702449562288128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18740993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2938 + ... + 6790.

Almost surely, 2^18740992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18740992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19693940).

18740992 is an abundant number, since it is smaller than the sum of its proper divisors (20646888).

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

18740992 is an equidigital number, since it uses as much as digits as its factorization.

18740992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888 (or 3874 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 18740992 is about 4329.0867397177. The cubic root of 18740992 is about 265.6220913545.

The spelling of 18740992 in words is "eighteen million, seven hundred forty thousand, nine hundred ninety-two".