138605955 has 16 divisors (see below), whose sum is σ = 222099360. Its totient is φ = 73813248.

The previous prime is 138605941. The next prime is 138605989. The reversal of 138605955 is 559506831.

It is not a de Polignac number, because 138605955 - 2⁵ = 138605923 is a prime.

It is a super-2 number, since 2×138605955² = 38423221522924050, which contains 22 as substring.

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, 4119 + ... + 17151.

It is an arithmetic number, because the mean of its divisors is an integer number (13881210).

Almost surely, 2^138605955 is an apocalyptic number.

138605955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138605955 is a deficient number, since it is larger than the sum of its proper divisors (83493405).

138605955 is a wasteful number, since it uses less digits than its factorization.

138605955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13750.

The product of its (nonzero) digits is 162000, while the sum is 42.

The square root of 138605955 is about 11773.1030319113. The cubic root of 138605955 is about 517.5201887151.

The spelling of 138605955 in words is "one hundred thirty-eight million, six hundred five thousand, nine hundred fifty-five".