138697888 has 24 divisors (see below), whose sum is σ = 312070752. Its totient is φ = 59441856.

The previous prime is 138697877. The next prime is 138697901. The reversal of 138697888 is 888796831.

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, 309370 + ... + 309817.

It is an arithmetic number, because the mean of its divisors is an integer number (13002948).

Almost surely, 2^138697888 is an apocalyptic number.

It is an amenable number.

138697888 is an abundant number, since it is smaller than the sum of its proper divisors (173372864).

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

138697888 is an equidigital number, since it uses as much as digits as its factorization.

138697888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619204 (or 619196 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 58.

The square root of 138697888 is about 11777.0067504438. The cubic root of 138697888 is about 517.6345817524.

The spelling of 138697888 in words is "one hundred thirty-eight million, six hundred ninety-seven thousand, eight hundred eighty-eight".