138877635 has 32 divisors (see below), whose sum is σ = 239899968. Its totient is φ = 68198400.

The previous prime is 138877597. The next prime is 138877637. The reversal of 138877635 is 536778831.

It is not a de Polignac number, because 138877635 - 2⁷ = 138877507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138877637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115035 + ... + 116235.

It is an arithmetic number, because the mean of its divisors is an integer number (7496874).

Almost surely, 2^138877635 is an apocalyptic number.

138877635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138877635 is a deficient number, since it is larger than the sum of its proper divisors (101022333).

138877635 is a wasteful number, since it uses less digits than its factorization.

138877635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815.

The product of its digits is 846720, while the sum is 48.

The square root of 138877635 is about 11784.6355480346. The cubic root of 138877635 is about 517.8580965681.

The spelling of 138877635 in words is "one hundred thirty-eight million, eight hundred seventy-seven thousand, six hundred thirty-five".