13328979 has 4 divisors (see below), whose sum is σ = 17771976. Its totient is φ = 8885984.

The previous prime is 13328971. The next prime is 13328981. The reversal of 13328979 is 97982331.

13328979 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97982331 = 3 ⋅32660777.

It is a cyclic number.

It is not a de Polignac number, because 13328979 - 2³ = 13328971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13328979.

It is not an unprimeable number, because it can be changed into a prime (13328971) 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, 2221494 + ... + 2221499.

It is an arithmetic number, because the mean of its divisors is an integer number (4442994).

Almost surely, 2^13328979 is an apocalyptic number.

13328979 is a deficient number, since it is larger than the sum of its proper divisors (4442997).

13328979 is an equidigital number, since it uses as much as digits as its factorization.

13328979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4442996.

The product of its digits is 81648, while the sum is 42.

The square root of 13328979 is about 3650.8874263664. The cubic root of 13328979 is about 237.1004043237.

The spelling of 13328979 in words is "thirteen million, three hundred twenty-eight thousand, nine hundred seventy-nine".