13722399 has 8 divisors (see below), whose sum is σ = 20329520. Its totient is φ = 9148248.

The previous prime is 13722361. The next prime is 13722403. The reversal of 13722399 is 99322731.

It is not a de Polignac number, because 13722399 - 2⁸ = 13722143 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 (13722799) 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 7 ways as a sum of consecutive naturals, for example, 254092 + ... + 254145.

It is an arithmetic number, because the mean of its divisors is an integer number (2541190).

Almost surely, 2^13722399 is an apocalyptic number.

13722399 is a deficient number, since it is larger than the sum of its proper divisors (6607121).

13722399 is an equidigital number, since it uses as much as digits as its factorization.

13722399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508246 (or 508240 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 13722399 is about 3704.3756558967. The cubic root of 13722399 is about 239.4105848926.

The spelling of 13722399 in words is "thirteen million, seven hundred twenty-two thousand, three hundred ninety-nine".