138659976 has 96 divisors (see below), whose sum is σ = 462221760. Its totient is φ = 36567936.

The previous prime is 138659959. The next prime is 138659977. The reversal of 138659976 is 679956831.

It is not an unprimeable number, because it can be changed into a prime (138659977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4030 + ... + 17133.

It is an arithmetic number, because the mean of its divisors is an integer number (4814810).

Almost surely, 2^138659976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138659976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231110880).

138659976 is an abundant number, since it is smaller than the sum of its proper divisors (323561784).

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

138659976 is a wasteful number, since it uses less digits than its factorization.

138659976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21195 (or 21188 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 138659976 is about 11775.3970633690. The cubic root of 138659976 is about 517.5874136451.

The spelling of 138659976 in words is "one hundred thirty-eight million, six hundred fifty-nine thousand, nine hundred seventy-six".