13220439 has 4 divisors (see below), whose sum is σ = 17627256. Its totient is φ = 8813624.

The previous prime is 13220437. The next prime is 13220461. The reversal of 13220439 is 93402231.

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 13220439 - 2¹ = 13220437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220437) 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, 2203404 + ... + 2203409.

It is an arithmetic number, because the mean of its divisors is an integer number (4406814).

Almost surely, 2^13220439 is an apocalyptic number.

13220439 is a deficient number, since it is larger than the sum of its proper divisors (4406817).

13220439 is an equidigital number, since it uses as much as digits as its factorization.

13220439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406816.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 13220439 is about 3635.9921617077. The cubic root of 13220439 is about 236.4550673219.

The spelling of 13220439 in words is "thirteen million, two hundred twenty thousand, four hundred thirty-nine".