25138818 has 24 divisors (see below), whose sum is σ = 57672108. Its totient is φ = 7886592.

The previous prime is 25138807. The next prime is 25138823. The reversal of 25138818 is 81883152.

It can be written as a sum of positive squares in 2 ways, for example, as 25130169 + 8649 = 5013^2 + 93^2 .

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, 40771 + ... + 41382.

Almost surely, 2^25138818 is an apocalyptic number.

25138818 is an abundant number, since it is smaller than the sum of its proper divisors (32533290).

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

25138818 is a wasteful number, since it uses less digits than its factorization.

25138818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82178 (or 82175 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 25138818 is about 5013.8625828796. The cubic root of 25138818 is about 292.9419835664.

The spelling of 25138818 in words is "twenty-five million, one hundred thirty-eight thousand, eight hundred eighteen".