11813979 has 4 divisors (see below), whose sum is σ = 15751976. Its totient is φ = 7875984.

The previous prime is 11813969. The next prime is 11813987. The reversal of 11813979 is 97931811.

11813979 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 11813979 - 2⁵ = 11813947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11813939) 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, 1968994 + ... + 1968999.

It is an arithmetic number, because the mean of its divisors is an integer number (3937994).

Almost surely, 2^11813979 is an apocalyptic number.

11813979 is a deficient number, since it is larger than the sum of its proper divisors (3937997).

11813979 is an equidigital number, since it uses as much as digits as its factorization.

11813979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937996.

The product of its digits is 13608, while the sum is 39.

The square root of 11813979 is about 3437.1469273221. The cubic root of 11813979 is about 227.7536774995.

The spelling of 11813979 in words is "eleven million, eight hundred thirteen thousand, nine hundred seventy-nine".