139343931 has 12 divisors (see below), whose sum is σ = 202119840. Its totient is φ = 92505840.

The previous prime is 139343921. The next prime is 139343957.

139343931 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 139343931 - 2¹¹ = 139341883 is a prime.

It is a super-2 number, since 2×139343931² = 38833462213065522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139343921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30240 + ... + 34541.

It is an arithmetic number, because the mean of its divisors is an integer number (16843320).

Almost surely, 2^139343931 is an apocalyptic number.

139343931 is a deficient number, since it is larger than the sum of its proper divisors (62775909).

139343931 is a wasteful number, since it uses less digits than its factorization.

139343931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65026 (or 65023 counting only the distinct ones).

The product of its digits is 26244, while the sum is 36.

The square root of 139343931 is about 11804.4030344613. The cubic root of 139343931 is about 518.4370364450.

The spelling of 139343931 in words is "one hundred thirty-nine million, three hundred forty-three thousand, nine hundred thirty-one".