13929965 has 12 divisors (see below), whose sum is σ = 19445436. Its totient is φ = 9551808.

The previous prime is 13929961. The next prime is 13929967. The reversal of 13929965 is 56992931.

It can be written as a sum of positive squares in 2 ways, for example, as 5368489 + 8561476 = 2317^2 + 2926^2 .

It is not a de Polignac number, because 13929965 - 2² = 13929961 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13929961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28184 + ... + 28673.

It is an arithmetic number, because the mean of its divisors is an integer number (1620453).

Almost surely, 2^13929965 is an apocalyptic number.

It is an amenable number.

13929965 is a deficient number, since it is larger than the sum of its proper divisors (5515471).

13929965 is an equidigital number, since it uses as much as digits as its factorization.

13929965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56876 (or 56869 counting only the distinct ones).

The product of its digits is 131220, while the sum is 44.

The square root of 13929965 is about 3732.2868324929. The cubic root of 13929965 is about 240.6116631727.

The spelling of 13929965 in words is "thirteen million, nine hundred twenty-nine thousand, nine hundred sixty-five".