13857399 has 10 divisors (see below), whose sum is σ = 20700680. Its totient is φ = 9238212.

The previous prime is 13857383. The next prime is 13857401. The reversal of 13857399 is 99375831.

It is a happy number.

It is not a de Polignac number, because 13857399 - 2⁴ = 13857383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13857359) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 85459 + ... + 85620.

It is an arithmetic number, because the mean of its divisors is an integer number (2070068).

Almost surely, 2^13857399 is an apocalyptic number.

13857399 is a deficient number, since it is larger than the sum of its proper divisors (6843281).

13857399 is an equidigital number, since it uses as much as digits as its factorization.

13857399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171091 (or 171082 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 13857399 is about 3722.5527531521. The cubic root of 13857399 is about 240.1931258018.

The spelling of 13857399 in words is "thirteen million, eight hundred fifty-seven thousand, three hundred ninety-nine".