138877587 has 6 divisors (see below), whose sum is σ = 200600972. Its totient is φ = 92585052.

The previous prime is 138877579. The next prime is 138877597. The reversal of 138877587 is 785778831.

It is not a de Polignac number, because 138877587 - 2³ = 138877579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138877507) 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, 7715413 + ... + 7715430.

Almost surely, 2^138877587 is an apocalyptic number.

138877587 is a deficient number, since it is larger than the sum of its proper divisors (61723385).

138877587 is a wasteful number, since it uses less digits than its factorization.

138877587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15430849 (or 15430846 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 54.

The square root of 138877587 is about 11784.6335114844. The cubic root of 138877587 is about 517.8580369060.

The spelling of 138877587 in words is "one hundred thirty-eight million, eight hundred seventy-seven thousand, five hundred eighty-seven".