13668939 has 16 divisors (see below), whose sum is σ = 20369440. Its totient is φ = 9059040.

The previous prime is 13668937. The next prime is 13668979. The reversal of 13668939 is 93986631.

It is not a de Polignac number, because 13668939 - 2¹ = 13668937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13668894 and 13668903.

It is not an unprimeable number, because it can be changed into a prime (13668931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3489 + ... + 6285.

It is an arithmetic number, because the mean of its divisors is an integer number (1273090).

Almost surely, 2^13668939 is an apocalyptic number.

13668939 is a deficient number, since it is larger than the sum of its proper divisors (6700501).

13668939 is a wasteful number, since it uses less digits than its factorization.

13668939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987 (or 2981 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 13668939 is about 3697.1528234575. The cubic root of 13668939 is about 239.0992800773.

The spelling of 13668939 in words is "thirteen million, six hundred sixty-eight thousand, nine hundred thirty-nine".