138285090 has 32 divisors (see below), whose sum is σ = 368760960. Its totient is φ = 36875952.

The previous prime is 138285083. The next prime is 138285107. The reversal of 138285090 is 90582831.

It is a super-2 number, since 2×138285090² = 38245532232616200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255814 + ... + 256353.

It is an arithmetic number, because the mean of its divisors is an integer number (11523780).

Almost surely, 2^138285090 is an apocalyptic number.

138285090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138285090 is an abundant number, since it is smaller than the sum of its proper divisors (230475870).

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

138285090 is a wasteful number, since it uses less digits than its factorization.

138285090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512183 (or 512177 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 138285090 is about 11759.4681002161. The cubic root of 138285090 is about 517.1205367768.

The spelling of 138285090 in words is "one hundred thirty-eight million, two hundred eighty-five thousand, ninety".