138856685 has 8 divisors (see below), whose sum is σ = 181776096. Its totient is φ = 100986640.

The previous prime is 138856673. The next prime is 138856703. The reversal of 138856685 is 586658831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138856685 - 2¹⁴ = 138840301 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1262279 + ... + 1262388.

It is an arithmetic number, because the mean of its divisors is an integer number (22722012).

Almost surely, 2^138856685 is an apocalyptic number.

It is an amenable number.

138856685 is a deficient number, since it is larger than the sum of its proper divisors (42919411).

138856685 is a wasteful number, since it uses less digits than its factorization.

138856685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524683.

The product of its digits is 1382400, while the sum is 50.

The square root of 138856685 is about 11783.7466452737. The cubic root of 138856685 is about 517.8320552435.

The spelling of 138856685 in words is "one hundred thirty-eight million, eight hundred fifty-six thousand, six hundred eighty-five".