13712309 has 8 divisors (see below), whose sum is σ = 14904120. Its totient is φ = 12540096.

The previous prime is 13712299. The next prime is 13712339. The reversal of 13712309 is 90321731.

It can be written as a sum of positive squares in 4 ways, for example, as 2002225 + 11710084 = 1415^2 + 3422^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13712309 - 2²⁰ = 12663733 is a prime.

It is a super-2 number, since 2×13712309² = 376054836222962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13712339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3422 + ... + 6255.

It is an arithmetic number, because the mean of its divisors is an integer number (1863015).

Almost surely, 2^13712309 is an apocalyptic number.

It is an amenable number.

13712309 is a deficient number, since it is larger than the sum of its proper divisors (1191811).

13712309 is a wasteful number, since it uses less digits than its factorization.

13712309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9799.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 13712309 is about 3703.0135025409. The cubic root of 13712309 is about 239.3518914354.

The spelling of 13712309 in words is "thirteen million, seven hundred twelve thousand, three hundred nine".