13639297 has 6 divisors (see below), whose sum is σ = 15866178. Its totient is φ = 11690784.

The previous prime is 13639289. The next prime is 13639303. The reversal of 13639297 is 79293631.

It can be written as a sum of positive squares in only one way, i.e., 7568001 + 6071296 = 2751^2 + 2464^2 .

It is not a de Polignac number, because 13639297 - 2³ = 13639289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13639217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139128 + ... + 139225.

It is an arithmetic number, because the mean of its divisors is an integer number (2644363).

Almost surely, 2^13639297 is an apocalyptic number.

It is an amenable number.

13639297 is a deficient number, since it is larger than the sum of its proper divisors (2226881).

13639297 is an equidigital number, since it uses as much as digits as its factorization.

13639297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278367 (or 278360 counting only the distinct ones).

The product of its digits is 61236, while the sum is 40.

The square root of 13639297 is about 3693.1418873366. The cubic root of 13639297 is about 238.9263207815.

The spelling of 13639297 in words is "thirteen million, six hundred thirty-nine thousand, two hundred ninety-seven".