13857971 has 2 divisors, whose sum is σ = 13857972. Its totient is φ = 13857970.

The previous prime is 13857967. The next prime is 13857989. The reversal of 13857971 is 17975831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13857971 - 2² = 13857967 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13857901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6928985 + 6928986.

It is an arithmetic number, because the mean of its divisors is an integer number (6928986).

Almost surely, 2^13857971 is an apocalyptic number.

13857971 is a deficient number, since it is larger than the sum of its proper divisors (1).

13857971 is an equidigital number, since it uses as much as digits as its factorization.

13857971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 41.

The square root of 13857971 is about 3722.6295813578. The cubic root of 13857971 is about 240.1964306205.

The spelling of 13857971 in words is "thirteen million, eight hundred fifty-seven thousand, nine hundred seventy-one".