13712209 has 15 divisors (see below), whose sum is σ = 16675977. Its totient is φ = 11242308.

The previous prime is 13712191. The next prime is 13712219. The reversal of 13712209 is 90221731.

The square root of 13712209 is 3703.

It is a perfect power (a square), and thus also a powerful number.

13712209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13712209 - 2¹⁷ = 13581137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13712219) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 596172 + ... + 596194.

Almost surely, 2^13712209 is an apocalyptic number.

13712209 is the 3703-rd square number.

13712209 is the 1852-nd centered octagonal number.

It is an amenable number.

13712209 is a deficient number, since it is larger than the sum of its proper divisors (2963768).

13712209 is an frugal number, since it uses more digits than its factorization.

13712209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The cubic root of 13712209 is about 239.3513095921.

Multiplying 13712209 by its sum of digits (25), we get a square (342805225 = 18515²).

The spelling of 13712209 in words is "thirteen million, seven hundred twelve thousand, two hundred nine".