138679881 has 16 divisors (see below), whose sum is σ = 186576000. Its totient is φ = 91623168.

The previous prime is 138679867. The next prime is 138679907. The reversal of 138679881 is 188976831.

It is not a de Polignac number, because 138679881 - 2⁶ = 138679817 is a prime.

It is a super-2 number, since 2×138679881² = 38464218788348322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138679831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231220 + ... + 231818.

It is an arithmetic number, because the mean of its divisors is an integer number (11661000).

Almost surely, 2^138679881 is an apocalyptic number.

It is an amenable number.

138679881 is a deficient number, since it is larger than the sum of its proper divisors (47896119).

138679881 is a wasteful number, since it uses less digits than its factorization.

138679881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168.

The product of its digits is 580608, while the sum is 51.

The square root of 138679881 is about 11776.2422274680. The cubic root of 138679881 is about 517.6121794663.

The spelling of 138679881 in words is "one hundred thirty-eight million, six hundred seventy-nine thousand, eight hundred eighty-one".