13897817 has 4 divisors (see below), whose sum is σ = 13905360. Its totient is φ = 13890276.

The previous prime is 13897787. The next prime is 13897831. The reversal of 13897817 is 71879831.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13897817 - 2⁸ = 13897561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13897867) 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, 1034 + ... + 5372.

It is an arithmetic number, because the mean of its divisors is an integer number (3476340).

Almost surely, 2^13897817 is an apocalyptic number.

It is an amenable number.

13897817 is a deficient number, since it is larger than the sum of its proper divisors (7543).

13897817 is an equidigital number, since it uses as much as digits as its factorization.

13897817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7542.

The product of its digits is 84672, while the sum is 44.

The square root of 13897817 is about 3727.9776018640. The cubic root of 13897817 is about 240.4264236097.

The spelling of 13897817 in words is "thirteen million, eight hundred ninety-seven thousand, eight hundred seventeen".