8139957 has 24 divisors (see below), whose sum is σ = 13220928. Its totient is φ = 4348800.

The previous prime is 8139919. The next prime is 8139959. The reversal of 8139957 is 7599318.

It is a happy number.

It is not a de Polignac number, because 8139957 - 2⁷ = 8139829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8139959) 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 23 ways as a sum of consecutive naturals, for example, 53832 + ... + 53982.

It is an arithmetic number, because the mean of its divisors is an integer number (550872).

Almost surely, 2^8139957 is an apocalyptic number.

It is an amenable number.

8139957 is a deficient number, since it is larger than the sum of its proper divisors (5080971).

8139957 is a wasteful number, since it uses less digits than its factorization.

8139957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 178 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 8139957 is about 2853.0609877814. The cubic root of 8139957 is about 201.1595723006.

It can be divided in two parts, 813995 and 7, that multiplied together give a palindrome (5697965).

The spelling of 8139957 in words is "eight million, one hundred thirty-nine thousand, nine hundred fifty-seven".