13309945 has 16 divisors (see below), whose sum is σ = 17559360. Its totient is φ = 9604800.

The previous prime is 13309913. The next prime is 13309949. The reversal of 13309945 is 54990331.

It is not a de Polignac number, because 13309945 - 2⁵ = 13309913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13309945.

It is not an unprimeable number, because it can be changed into a prime (13309949) 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, 6775 + ... + 8515.

It is an arithmetic number, because the mean of its divisors is an integer number (1097460).

Almost surely, 2^13309945 is an apocalyptic number.

It is an amenable number.

13309945 is a deficient number, since it is larger than the sum of its proper divisors (4249415).

13309945 is a wasteful number, since it uses less digits than its factorization.

13309945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 13309945 is about 3648.2797315995. The cubic root of 13309945 is about 236.9874894736.

The spelling of 13309945 in words is "thirteen million, three hundred nine thousand, nine hundred forty-five".