13855917 has 4 divisors (see below), whose sum is σ = 18474560. Its totient is φ = 9237276.

The previous prime is 13855903. The next prime is 13855927. The reversal of 13855917 is 71955831.

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 not a de Polignac number, because 13855917 - 2⁷ = 13855789 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 (13855927) 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, 2309317 + ... + 2309322.

It is an arithmetic number, because the mean of its divisors is an integer number (4618640).

Almost surely, 2^13855917 is an apocalyptic number.

It is an amenable number.

13855917 is a deficient number, since it is larger than the sum of its proper divisors (4618643).

13855917 is an equidigital number, since it uses as much as digits as its factorization.

13855917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618642.

The product of its digits is 37800, while the sum is 39.

The square root of 13855917 is about 3722.3536908789. The cubic root of 13855917 is about 240.1845628936.

The spelling of 13855917 in words is "thirteen million, eight hundred fifty-five thousand, nine hundred seventeen".