13915997 has 4 divisors (see below), whose sum is σ = 13993920. Its totient is φ = 13838076.

The previous prime is 13915981. The next prime is 13916011. The reversal of 13915997 is 79951931.

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 13915997 - 2⁴ = 13915981 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 (13915907) 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, 38693 + ... + 39050.

It is an arithmetic number, because the mean of its divisors is an integer number (3498480).

Almost surely, 2^13915997 is an apocalyptic number.

It is an amenable number.

13915997 is a deficient number, since it is larger than the sum of its proper divisors (77923).

13915997 is an equidigital number, since it uses as much as digits as its factorization.

13915997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77922.

The product of its digits is 76545, while the sum is 44.

The square root of 13915997 is about 3730.4151243528. The cubic root of 13915997 is about 240.5312133968.

The spelling of 13915997 in words is "thirteen million, nine hundred fifteen thousand, nine hundred ninety-seven".