18956308 has 12 divisors (see below), whose sum is σ = 37912672. Its totient is φ = 8124120.

The previous prime is 18956303. The next prime is 18956317. The reversal of 18956308 is 80365981.

It is a happy number.

18956308 is an admirable number.

It is a super-2 number, since 2×18956308² = 718683225981728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18956303) 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, 338478 + ... + 338533.

Almost surely, 2^18956308 is an apocalyptic number.

It is an amenable number.

18956308 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18956308 is a wasteful number, since it uses less digits than its factorization.

18956308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677022 (or 677020 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 18956308 is about 4353.8842428342. The cubic root of 18956308 is about 266.6354678778.

The spelling of 18956308 in words is "eighteen million, nine hundred fifty-six thousand, three hundred eight".