18452538 has 24 divisors (see below), whose sum is σ = 43056468. Its totient is φ = 5677632.

The previous prime is 18452527. The next prime is 18452543. The reversal of 18452538 is 83525481.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16621929 + 1830609 = 4077^2 + 1353^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39195 + ... + 39662.

Almost surely, 2^18452538 is an apocalyptic number.

18452538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18452538 is an abundant number, since it is smaller than the sum of its proper divisors (24603930).

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

18452538 is a wasteful number, since it uses less digits than its factorization.

18452538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78878 (or 78875 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 18452538 is about 4295.6417448386. The cubic root of 18452538 is about 264.2522554463.

The spelling of 18452538 in words is "eighteen million, four hundred fifty-two thousand, five hundred thirty-eight".