138808831 has 8 divisors (see below), whose sum is σ = 158771360. Its totient is φ = 118879488.

The previous prime is 138808823. The next prime is 138808883.

138808831 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 138808831 - 2³ = 138808823 is a prime.

It is a super-2 number, since 2×138808831² = 38535783127173122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138808801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1435 + ... + 16723.

It is an arithmetic number, because the mean of its divisors is an integer number (19846420).

Almost surely, 2^138808831 is an apocalyptic number.

138808831 is a deficient number, since it is larger than the sum of its proper divisors (19962529).

138808831 is a wasteful number, since it uses less digits than its factorization.

138808831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16593.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 138808831 is about 11781.7159616076. The cubic root of 138808831 is about 517.7725618112.

The spelling of 138808831 in words is "one hundred thirty-eight million, eight hundred eight thousand, eight hundred thirty-one".