138618475 has 12 divisors (see below), whose sum is σ = 172039336. Its totient is φ = 110796480.

The previous prime is 138618451. The next prime is 138618481. The reversal of 138618475 is 574816831.

It is not a de Polignac number, because 138618475 - 2⁵ = 138618443 is a prime.

It is a super-2 number, since 2×138618475² = 38430163222651250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42244 + ... + 45406.

Almost surely, 2^138618475 is an apocalyptic number.

138618475 is a deficient number, since it is larger than the sum of its proper divisors (33420861).

138618475 is a wasteful number, since it uses less digits than its factorization.

138618475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4926 (or 4921 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 138618475 is about 11773.6347403850. The cubic root of 138618475 is about 517.5357704354.

It can be divided in two parts, 138618 and 475, that multiplied together give a triangular number (65843550 = T₁₁₄₇₅).

The spelling of 138618475 in words is "one hundred thirty-eight million, six hundred eighteen thousand, four hundred seventy-five".