138890279475 has 24 divisors (see below), whose sum is σ = 255146588720. Its totient is φ = 74074815360.

The previous prime is 138890279467. The next prime is 138890279519. The reversal of 138890279475 is 574972098831.

138890279475 is a `hidden beast` number, since 1 + 3 + 8 + 8 + 90 + 2 + 79 + 475 = 666.

It is not a de Polignac number, because 138890279475 - 2³ = 138890279467 is a prime.

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, 102881014 + ... + 102882363.

Almost surely, 2^138890279475 is an apocalyptic number.

138890279475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138890279475 is a deficient number, since it is larger than the sum of its proper divisors (116256309245).

138890279475 is a wasteful number, since it uses less digits than its factorization.

138890279475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205763396 (or 205763385 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 138890279475 in words is "one hundred thirty-eight billion, eight hundred ninety million, two hundred seventy-nine thousand, four hundred seventy-five".