18255872 has 26 divisors (see below), whose sum is σ = 36515478. Its totient is φ = 9125888.

The previous prime is 18255863. The next prime is 18255889. The reversal of 18255872 is 27855281.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16777216 + 1478656 = 4096^2 + 1216^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1868 + ... + 6324.

Almost surely, 2^18255872 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 18255872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18257739).

18255872 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.

18255872 is an frugal number, since it uses more digits than its factorization.

18255872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4481 (or 4459 counting only the distinct ones).

The product of its digits is 44800, while the sum is 38.

The square root of 18255872 is about 4272.6890830015. The cubic root of 18255872 is about 263.3101056619.

The spelling of 18255872 in words is "eighteen million, two hundred fifty-five thousand, eight hundred seventy-two".