13977697 has 4 divisors (see below), whose sum is σ = 14028436. Its totient is φ = 13926960.

The previous prime is 13977671. The next prime is 13977703. The reversal of 13977697 is 79677931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6843456 + 7134241 = 2616^2 + 2671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13977697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13977697.

It is not an unprimeable number, because it can be changed into a prime (13977647) 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, 24954 + ... + 25507.

It is an arithmetic number, because the mean of its divisors is an integer number (3507109).

Almost surely, 2^13977697 is an apocalyptic number.

It is an amenable number.

13977697 is a deficient number, since it is larger than the sum of its proper divisors (50739).

13977697 is an equidigital number, since it uses as much as digits as its factorization.

13977697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50738.

The product of its digits is 500094, while the sum is 49.

The square root of 13977697 is about 3738.6758351053. The cubic root of 13977697 is about 240.8861741019.

The spelling of 13977697 in words is "thirteen million, nine hundred seventy-seven thousand, six hundred ninety-seven".