13399779 has 4 divisors (see below), whose sum is σ = 17866376. Its totient is φ = 8933184.

The previous prime is 13399709. The next prime is 13399811. The reversal of 13399779 is 97799331.

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

It is not a de Polignac number, because 13399779 - 2⁷ = 13399651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13399709) 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, 2233294 + ... + 2233299.

It is an arithmetic number, because the mean of its divisors is an integer number (4466594).

Almost surely, 2^13399779 is an apocalyptic number.

13399779 is a deficient number, since it is larger than the sum of its proper divisors (4466597).

13399779 is an equidigital number, since it uses as much as digits as its factorization.

13399779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4466596.

The product of its digits is 321489, while the sum is 48.

The square root of 13399779 is about 3660.5708571205. The cubic root of 13399779 is about 237.5194680256.

The spelling of 13399779 in words is "thirteen million, three hundred ninety-nine thousand, seven hundred seventy-nine".