13223279 has 4 divisors (see below), whose sum is σ = 13545840. Its totient is φ = 12900720.

The previous prime is 13223269. The next prime is 13223281. The reversal of 13223279 is 97232231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13223279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13223239) 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, 161219 + ... + 161300.

It is an arithmetic number, because the mean of its divisors is an integer number (3386460).

Almost surely, 2^13223279 is an apocalyptic number.

13223279 is a deficient number, since it is larger than the sum of its proper divisors (322561).

13223279 is an equidigital number, since it uses as much as digits as its factorization.

13223279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322560.

The product of its digits is 4536, while the sum is 29.

The square root of 13223279 is about 3636.3826806319. The cubic root of 13223279 is about 236.4719977812.

The spelling of 13223279 in words is "thirteen million, two hundred twenty-three thousand, two hundred seventy-nine".