138606831 has 36 divisors (see below), whose sum is σ = 233041536. Its totient is φ = 79052160.

The previous prime is 138606821. The next prime is 138606869.

138606831 is a `hidden beast` number, since 13 + 8 + 606 + 8 + 31 = 666.

138606831 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 138606831 - 2¹³ = 138598639 is a prime.

It is a super-2 number, since 2×138606831² = 38423707199725122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138606821) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14770 + ... + 22256.

It is an arithmetic number, because the mean of its divisors is an integer number (6473376).

Almost surely, 2^138606831 is an apocalyptic number.

138606831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138606831 is a deficient number, since it is larger than the sum of its proper divisors (94434705).

138606831 is a wasteful number, since it uses less digits than its factorization.

138606831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7532 (or 7518 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 138606831 is about 11773.1402352983. The cubic root of 138606831 is about 517.5212789682.

The spelling of 138606831 in words is "one hundred thirty-eight million, six hundred six thousand, eight hundred thirty-one".