13979997 has 6 divisors (see below), whose sum is σ = 20193342. Its totient is φ = 9319992.

The previous prime is 13979983. The next prime is 13980047. The reversal of 13979997 is 79997931.

It can be written as a sum of positive squares in only one way, i.e., 12489156 + 1490841 = 3534^2 + 1221^2 .

It is not a de Polignac number, because 13979997 - 2⁸ = 13979741 is a prime.

It is a super-2 number, since 2×13979997² = 390880632240018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13979197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 776658 + ... + 776675.

It is an arithmetic number, because the mean of its divisors is an integer number (3365557).

Almost surely, 2^13979997 is an apocalyptic number.

It is an amenable number.

13979997 is a deficient number, since it is larger than the sum of its proper divisors (6213345).

13979997 is a wasteful number, since it uses less digits than its factorization.

13979997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553339 (or 1553336 counting only the distinct ones).

The product of its digits is 964467, while the sum is 54.

The square root of 13979997 is about 3738.9834179894. The cubic root of 13979997 is about 240.8993858114.

The spelling of 13979997 in words is "thirteen million, nine hundred seventy-nine thousand, nine hundred ninety-seven".