138677858 has 18 divisors (see below), whose sum is σ = 228948993. Its totient is φ = 62952120.

The previous prime is 138677809. The next prime is 138677863. The reversal of 138677858 is 858776831.

It can be written as a sum of positive squares in 2 ways, for example, as 136726249 + 1951609 = 11693^2 + 1397^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8327.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 182816 + ... + 183572.

Almost surely, 2^138677858 is an apocalyptic number.

138677858 is a deficient number, since it is larger than the sum of its proper divisors (90271135).

138677858 is an frugal number, since it uses more digits than its factorization.

138677858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538 (or 770 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 53.

The square root of 138677858 is about 11776.1563338808. The cubic root of 138677858 is about 517.6096625558.

The spelling of 138677858 in words is "one hundred thirty-eight million, six hundred seventy-seven thousand, eight hundred fifty-eight".