138813856 has 24 divisors (see below), whose sum is σ = 273581280. Its totient is φ = 69332928.

The previous prime is 138813839. The next prime is 138813881. The reversal of 138813856 is 658318831.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40165 + ... + 43483.

It is an arithmetic number, because the mean of its divisors is an integer number (11399220).

Almost surely, 2^138813856 is an apocalyptic number.

138813856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138813856 is a deficient number, since it is larger than the sum of its proper divisors (134767424).

138813856 is a wasteful number, since it uses less digits than its factorization.

138813856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636 (or 4628 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 138813856 is about 11781.9292138427. The cubic root of 138813856 is about 517.7788096743.

The spelling of 138813856 in words is "one hundred thirty-eight million, eight hundred thirteen thousand, eight hundred fifty-six".