138591496 has 8 divisors (see below), whose sum is σ = 259859070. Its totient is φ = 69295744.

The previous prime is 138591473. The next prime is 138591527. The reversal of 138591496 is 694195831.

It can be written as a sum of positive squares in only one way, i.e., 108451396 + 30140100 = 10414^2 + 5490^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8661961 + ... + 8661976.

Almost surely, 2^138591496 is an apocalyptic number.

It is an amenable number.

138591496 is a deficient number, since it is larger than the sum of its proper divisors (121267574).

138591496 is a wasteful number, since it uses less digits than its factorization.

138591496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17323943 (or 17323939 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 138591496 is about 11772.4889466926. The cubic root of 138591496 is about 517.5021926518.

The spelling of 138591496 in words is "one hundred thirty-eight million, five hundred ninety-one thousand, four hundred ninety-six".