13979857 has 2 divisors, whose sum is σ = 13979858. Its totient is φ = 13979856.

The previous prime is 13979851. The next prime is 13979921. The reversal of 13979857 is 75897931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13075456 + 904401 = 3616^2 + 951^2 .

It is a cyclic number.

It is not a de Polignac number, because 13979857 - 2¹¹ = 13977809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13979857.

It is not a weakly prime, because it can be changed into another prime (13979851) 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 as a sum of consecutive naturals, namely, 6989928 + 6989929.

It is an arithmetic number, because the mean of its divisors is an integer number (6989929).

Almost surely, 2^13979857 is an apocalyptic number.

It is an amenable number.

13979857 is a deficient number, since it is larger than the sum of its proper divisors (1).

13979857 is an equidigital number, since it uses as much as digits as its factorization.

13979857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 49.

The square root of 13979857 is about 3738.9646962762. The cubic root of 13979857 is about 240.8985816618.

The spelling of 13979857 in words is "thirteen million, nine hundred seventy-nine thousand, eight hundred fifty-seven".