13660709 has 4 divisors (see below), whose sum is σ = 13847916. Its totient is φ = 13473504.

The previous prime is 13660663. The next prime is 13660763. The reversal of 13660709 is 90706631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5987809 + 7672900 = 2447^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 13660709 - 2⁸ = 13660453 is a prime.

It is a super-2 number, since 2×13660709² = 373229940765362, 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 (13660109) 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, 93494 + ... + 93639.

It is an arithmetic number, because the mean of its divisors is an integer number (3461979).

Almost surely, 2^13660709 is an apocalyptic number.

It is an amenable number.

13660709 is a deficient number, since it is larger than the sum of its proper divisors (187207).

13660709 is an equidigital number, since it uses as much as digits as its factorization.

13660709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187206.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 13660709 is about 3696.0396372333. The cubic root of 13660709 is about 239.0512836152.

The spelling of 13660709 in words is "thirteen million, six hundred sixty thousand, seven hundred nine".