138961976 has 16 divisors (see below), whose sum is σ = 262861200. Its totient is φ = 68865664.

The previous prime is 138961969. The next prime is 138961987. The reversal of 138961976 is 679169831.

It is a congruent 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, 75956 + ... + 77763.

It is an arithmetic number, because the mean of its divisors is an integer number (16428825).

Almost surely, 2^138961976 is an apocalyptic number.

It is an amenable number.

138961976 is a deficient number, since it is larger than the sum of its proper divisors (123899224).

138961976 is a wasteful number, since it uses less digits than its factorization.

138961976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153838 (or 153834 counting only the distinct ones).

The product of its digits is 489888, while the sum is 50.

The square root of 138961976 is about 11788.2134354617. The cubic root of 138961976 is about 517.9629078552.

The spelling of 138961976 in words is "one hundred thirty-eight million, nine hundred sixty-one thousand, nine hundred seventy-six".