18840256 has 28 divisors (see below), whose sum is σ = 38679120. Its totient is φ = 9094400.

The previous prime is 18840247. The next prime is 18840271. The reversal of 18840256 is 65204881.

It is a super-2 number, since 2×18840256² = 709910492291072, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3220 + ... + 6931.

Almost surely, 2^18840256 is an apocalyptic number.

18840256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18840256 is an abundant number, since it is smaller than the sum of its proper divisors (19838864).

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

18840256 is a wasteful number, since it uses less digits than its factorization.

18840256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10192 (or 10182 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 18840256 is about 4340.5363723853. The cubic root of 18840256 is about 266.0902326399.

The spelling of 18840256 in words is "eighteen million, eight hundred forty thousand, two hundred fifty-six".