18425538 has 48 divisors (see below), whose sum is σ = 41231736. Its totient is φ = 5944320.

The previous prime is 18425521. The next prime is 18425587. The reversal of 18425538 is 83552481.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14493249 + 3932289 = 3807^2 + 1983^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106420 + ... + 106592.

Almost surely, 2^18425538 is an apocalyptic number.

18425538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18425538 is an abundant number, since it is smaller than the sum of its proper divisors (22806198).

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

18425538 is a wasteful number, since it uses less digits than its factorization.

18425538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 336 counting only the distinct ones).

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

The square root of 18425538 is about 4292.4978741987. The cubic root of 18425538 is about 264.1233067231.

The spelling of 18425538 in words is "eighteen million, four hundred twenty-five thousand, five hundred thirty-eight".