138979870 has 32 divisors (see below), whose sum is σ = 269470080. Its totient is φ = 51438240.

The previous prime is 138979859. The next prime is 138979891. The reversal of 138979870 is 78979831.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336 + ... + 16675.

It is an arithmetic number, because the mean of its divisors is an integer number (8420940).

Almost surely, 2^138979870 is an apocalyptic number.

138979870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138979870 is a deficient number, since it is larger than the sum of its proper divisors (130490210).

138979870 is a wasteful number, since it uses less digits than its factorization.

138979870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17080.

The product of its (nonzero) digits is 762048, while the sum is 52.

The square root of 138979870 is about 11788.9723894833. The cubic root of 138979870 is about 517.9851394295.

The spelling of 138979870 in words is "one hundred thirty-eight million, nine hundred seventy-nine thousand, eight hundred seventy".