13143979 has 4 divisors (see below), whose sum is σ = 13238680. Its totient is φ = 13049280.

The previous prime is 13143967. The next prime is 13143997. The reversal of 13143979 is 97934131.

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

It is a cyclic number.

It is not a de Polignac number, because 13143979 - 2¹⁵ = 13111211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13143959) 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 3 ways as a sum of consecutive naturals, for example, 47142 + ... + 47419.

It is an arithmetic number, because the mean of its divisors is an integer number (3309670).

Almost surely, 2^13143979 is an apocalyptic number.

13143979 is a deficient number, since it is larger than the sum of its proper divisors (94701).

13143979 is an equidigital number, since it uses as much as digits as its factorization.

13143979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94700.

The product of its digits is 20412, while the sum is 37.

The square root of 13143979 is about 3625.4625911737. The cubic root of 13143979 is about 235.9983421793.

The spelling of 13143979 in words is "thirteen million, one hundred forty-three thousand, nine hundred seventy-nine".