138979866 has 8 divisors (see below), whose sum is σ = 277959744. Its totient is φ = 46326620.

The previous prime is 138979859. The next prime is 138979891. The reversal of 138979866 is 668979831.

It is a sphenic number, since it is the product of 3 distinct primes.

138979866 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11581650 + ... + 11581661.

It is an arithmetic number, because the mean of its divisors is an integer number (34744968).

Almost surely, 2^138979866 is an apocalyptic number.

138979866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138979866 is a wasteful number, since it uses less digits than its factorization.

138979866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23163316.

The product of its digits is 3919104, while the sum is 57.

The square root of 138979866 is about 11788.9722198332. The cubic root of 138979866 is about 517.9851344601.

The spelling of 138979866 in words is "one hundred thirty-eight million, nine hundred seventy-nine thousand, eight hundred sixty-six".