18990256 has 20 divisors (see below), whose sum is σ = 37577952. Its totient is φ = 9292736.

The previous prime is 18990247. The next prime is 18990277. The reversal of 18990256 is 65209981.

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, 11875 + ... + 13378.

Almost surely, 2^18990256 is an apocalyptic number.

18990256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18990256 is a deficient number, since it is larger than the sum of its proper divisors (18587696).

18990256 is a wasteful number, since it uses less digits than its factorization.

18990256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25308 (or 25302 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 18990256 is about 4357.7810867459. The cubic root of 18990256 is about 266.7945414481.

The spelling of 18990256 in words is "eighteen million, nine hundred ninety thousand, two hundred fifty-six".