13861257 has 4 divisors (see below), whose sum is σ = 18481680. Its totient is φ = 9240836.

The previous prime is 13861229. The next prime is 13861303. The reversal of 13861257 is 75216831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13861257 - 2⁷ = 13861129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13861657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2310207 + ... + 2310212.

It is an arithmetic number, because the mean of its divisors is an integer number (4620420).

Almost surely, 2^13861257 is an apocalyptic number.

It is an amenable number.

13861257 is a deficient number, since it is larger than the sum of its proper divisors (4620423).

13861257 is an equidigital number, since it uses as much as digits as its factorization.

13861257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620422.

The product of its digits is 10080, while the sum is 33.

The square root of 13861257 is about 3723.0709098807. The cubic root of 13861257 is about 240.2154142340.

The spelling of 13861257 in words is "thirteen million, eight hundred sixty-one thousand, two hundred fifty-seven".