138727831 has 6 divisors (see below), whose sum is σ = 152486096. Its totient is φ = 126116100.

The previous prime is 138727817. The next prime is 138727859.

138727831 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 138727831 - 2¹³ = 138719639 is a prime.

It is a super-2 number, since 2×138727831² = 38490822187929122, 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 (138727861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 573135 + ... + 573376.

Almost surely, 2^138727831 is an apocalyptic number.

138727831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138727831 is a deficient number, since it is larger than the sum of its proper divisors (13758265).

138727831 is a wasteful number, since it uses less digits than its factorization.

138727831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146533 (or 1146522 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The square root of 138727831 is about 11778.2779301560. The cubic root of 138727831 is about 517.6718291762.

The spelling of 138727831 in words is "one hundred thirty-eight million, seven hundred twenty-seven thousand, eight hundred thirty-one".