138856311 has 12 divisors (see below), whose sum is σ = 218804040. Its totient is φ = 84155280.

The previous prime is 138856297. The next prime is 138856327. The reversal of 138856311 is 113658831.

138856311 is a `hidden beast` number, since 1 + 3 + 88 + 563 + 11 = 666.

It is not a de Polignac number, because 138856311 - 2¹⁵ = 138823543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138856511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 701196 + ... + 701393.

It is an arithmetic number, because the mean of its divisors is an integer number (18233670).

Almost surely, 2^138856311 is an apocalyptic number.

138856311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138856311 is a deficient number, since it is larger than the sum of its proper divisors (79947729).

138856311 is a wasteful number, since it uses less digits than its factorization.

138856311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402606 (or 1402603 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 138856311 is about 11783.7307759470. The cubic root of 138856311 is about 517.8315903292.

The spelling of 138856311 in words is "one hundred thirty-eight million, eight hundred fifty-six thousand, three hundred eleven".