13957997 has 4 divisors (see below), whose sum is σ = 14016156. Its totient is φ = 13899840.

The previous prime is 13957981. The next prime is 13958011. The reversal of 13957997 is 79975931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79975931 = 7 ⋅11425133.

It can be written as a sum of positive squares in 2 ways, for example, as 9853321 + 4104676 = 3139^2 + 2026^2 .

It is a cyclic number.

It is not a de Polignac number, because 13957997 - 2⁴ = 13957981 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 (13953997) 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, 28718 + ... + 29199.

It is an arithmetic number, because the mean of its divisors is an integer number (3504039).

Almost surely, 2^13957997 is an apocalyptic number.

It is an amenable number.

13957997 is a deficient number, since it is larger than the sum of its proper divisors (58159).

13957997 is an equidigital number, since it uses as much as digits as its factorization.

13957997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58158.

The product of its digits is 535815, while the sum is 50.

The square root of 13957997 is about 3736.0402835087. The cubic root of 13957997 is about 240.7729535246.

The spelling of 13957997 in words is "thirteen million, nine hundred fifty-seven thousand, nine hundred ninety-seven".