139431957 has 16 divisors (see below), whose sum is σ = 221706240. Its totient is φ = 76210992.

The previous prime is 139431953. The next prime is 139431967. The reversal of 139431957 is 759134931.

It is not a de Polignac number, because 139431957 - 2² = 139431953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139431953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143857 + ... + 144822.

It is an arithmetic number, because the mean of its divisors is an integer number (13856640).

Almost surely, 2^139431957 is an apocalyptic number.

It is an amenable number.

139431957 is a deficient number, since it is larger than the sum of its proper divisors (82274283).

139431957 is a wasteful number, since it uses less digits than its factorization.

139431957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288712.

The product of its digits is 102060, while the sum is 42.

The square root of 139431957 is about 11808.1309698021. The cubic root of 139431957 is about 518.5461820483.

The spelling of 139431957 in words is "one hundred thirty-nine million, four hundred thirty-one thousand, nine hundred fifty-seven".