138857385 has 16 divisors (see below), whose sum is σ = 225938880. Its totient is φ = 72801600.

The previous prime is 138857351. The next prime is 138857393. The reversal of 138857385 is 583758831.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-138857385 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77566 + ... + 79335.

It is an arithmetic number, because the mean of its divisors is an integer number (14121180).

Almost surely, 2^138857385 is an apocalyptic number.

138857385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138857385 is a deficient number, since it is larger than the sum of its proper divisors (87081495).

138857385 is a wasteful number, since it uses less digits than its factorization.

138857385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156968.

The product of its digits is 806400, while the sum is 48.

The square root of 138857385 is about 11783.7763471648. The cubic root of 138857385 is about 517.8329254017.

The spelling of 138857385 in words is "one hundred thirty-eight million, eight hundred fifty-seven thousand, three hundred eighty-five".