138877208 has 8 divisors (see below), whose sum is σ = 260394780. Its totient is φ = 69438600.

The previous prime is 138877187. The next prime is 138877217. The reversal of 138877208 is 802778831.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8679818 + ... + 8679833.

Almost surely, 2^138877208 is an apocalyptic number.

It is an amenable number.

138877208 is a deficient number, since it is larger than the sum of its proper divisors (121517572).

138877208 is a wasteful number, since it uses less digits than its factorization.

138877208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17359657 (or 17359653 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 44.

The square root of 138877208 is about 11784.6174312109. The cubic root of 138877208 is about 517.8575658236.

The spelling of 138877208 in words is "one hundred thirty-eight million, eight hundred seventy-seven thousand, two hundred eight".