18521056 has 24 divisors (see below), whose sum is σ = 36714384. Its totient is φ = 9196800.

The previous prime is 18521047. The next prime is 18521071. The reversal of 18521056 is 65012581.

It is an alternating number because its digits alternate between odd and even.

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, 2916 + ... + 6748.

It is an arithmetic number, because the mean of its divisors is an integer number (1529766).

Almost surely, 2^18521056 is an apocalyptic number.

18521056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18521056 is a deficient number, since it is larger than the sum of its proper divisors (18193328).

18521056 is a wasteful number, since it uses less digits than its factorization.

18521056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3994 (or 3986 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 18521056 is about 4303.6096477260. The cubic root of 18521056 is about 264.5789254451.

The spelling of 18521056 in words is "eighteen million, five hundred twenty-one thousand, fifty-six".