18538065 has 80 divisors (see below), whose sum is σ = 40981248. Its totient is φ = 7807104.

The previous prime is 18538001. The next prime is 18538099. The reversal of 18538065 is 56083581.

It is not a de Polignac number, because 18538065 - 2⁶ = 18538001 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 79 ways as a sum of consecutive naturals, for example, 36604 + ... + 37106.

Almost surely, 2^18538065 is an apocalyptic number.

18538065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18538065 is an abundant number, since it is smaller than the sum of its proper divisors (22443183).

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

18538065 is a wasteful number, since it uses less digits than its factorization.

18538065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 18538065 is about 4305.5853260620. The cubic root of 18538065 is about 264.6598935792.

The spelling of 18538065 in words is "eighteen million, five hundred thirty-eight thousand, sixty-five".