13939709 has 4 divisors (see below), whose sum is σ = 15931104. Its totient is φ = 11948316.

The previous prime is 13939703. The next prime is 13939721. The reversal of 13939709 is 90793931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13939709 - 2⁴ = 13939693 is a prime.

It is a super-3 number, since 3×13939709³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13939703) 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, 995687 + ... + 995700.

It is an arithmetic number, because the mean of its divisors is an integer number (3982776).

Almost surely, 2^13939709 is an apocalyptic number.

It is an amenable number.

13939709 is a deficient number, since it is larger than the sum of its proper divisors (1991395).

13939709 is an equidigital number, since it uses as much as digits as its factorization.

13939709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991394.

The product of its (nonzero) digits is 45927, while the sum is 41.

The square root of 13939709 is about 3733.5919702078. The cubic root of 13939709 is about 240.6677526554.

The spelling of 13939709 in words is "thirteen million, nine hundred thirty-nine thousand, seven hundred nine".