13977857 has 2 divisors, whose sum is σ = 13977858. Its totient is φ = 13977856.

The previous prime is 13977853. The next prime is 13977871. The reversal of 13977857 is 75877931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12117361 + 1860496 = 3481^2 + 1364^2 .

It is a cyclic number.

It is not a de Polignac number, because 13977857 - 2² = 13977853 is a prime.

It is not a weakly prime, because it can be changed into another prime (13977853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6988928 + 6988929.

It is an arithmetic number, because the mean of its divisors is an integer number (6988929).

Almost surely, 2^13977857 is an apocalyptic number.

It is an amenable number.

13977857 is a deficient number, since it is larger than the sum of its proper divisors (1).

13977857 is an equidigital number, since it uses as much as digits as its factorization.

13977857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 370440, while the sum is 47.

The square root of 13977857 is about 3738.6972329944. The cubic root of 13977857 is about 240.8870932243.

The spelling of 13977857 in words is "thirteen million, nine hundred seventy-seven thousand, eight hundred fifty-seven".