138389679 has 6 divisors (see below), whose sum is σ = 199896216. Its totient is φ = 92259780.

The previous prime is 138389659. The next prime is 138389681. The reversal of 138389679 is 976983831.

It is a de Polignac number, because none of the positive numbers 2^k-138389679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138389659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7688307 + ... + 7688324.

It is an arithmetic number, because the mean of its divisors is an integer number (33316036).

Almost surely, 2^138389679 is an apocalyptic number.

138389679 is a deficient number, since it is larger than the sum of its proper divisors (61506537).

138389679 is a wasteful number, since it uses less digits than its factorization.

138389679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15376637 (or 15376634 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 138389679 is about 11763.9142720440. The cubic root of 138389679 is about 517.2508749792.

The spelling of 138389679 in words is "one hundred thirty-eight million, three hundred eighty-nine thousand, six hundred seventy-nine".