138881976 has 32 divisors (see below), whose sum is σ = 367629840. Its totient is φ = 43570688.

The previous prime is 138881927. The next prime is 138881987. The reversal of 138881976 is 679188831.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169791 + ... + 170606.

Almost surely, 2^138881976 is an apocalyptic number.

It is an amenable number.

138881976 is an abundant number, since it is smaller than the sum of its proper divisors (228747864).

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

138881976 is a wasteful number, since it uses less digits than its factorization.

138881976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340423 (or 340419 counting only the distinct ones).

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

The square root of 138881976 is about 11784.8197270896. The cubic root of 138881976 is about 517.8634922019.

The spelling of 138881976 in words is "one hundred thirty-eight million, eight hundred eighty-one thousand, nine hundred seventy-six".