13699979 has 4 divisors (see below), whose sum is σ = 13798680. Its totient is φ = 13601280.

The previous prime is 13699957. The next prime is 13699981. The reversal of 13699979 is 97999631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97999631 = 1789 ⋅54779.

It is a cyclic number.

It is not a de Polignac number, because 13699979 - 2⁸ = 13699723 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 13699979.

It is not an unprimeable number, because it can be changed into a prime (13699949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49142 + ... + 49419.

It is an arithmetic number, because the mean of its divisors is an integer number (3449670).

Almost surely, 2^13699979 is an apocalyptic number.

13699979 is a deficient number, since it is larger than the sum of its proper divisors (98701).

13699979 is an equidigital number, since it uses as much as digits as its factorization.

13699979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98700.

The product of its digits is 826686, while the sum is 53.

The square root of 13699979 is about 3701.3482678613. The cubic root of 13699979 is about 239.2801288113.

The spelling of 13699979 in words is "thirteen million, six hundred ninety-nine thousand, nine hundred seventy-nine".