13209985 has 16 divisors (see below), whose sum is σ = 16381440. Its totient is φ = 10221120.

The previous prime is 13209983. The next prime is 13209991. The reversal of 13209985 is 58990231.

It is not a de Polignac number, because 13209985 - 2¹ = 13209983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13209983) 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, 20620 + ... + 21250.

It is an arithmetic number, because the mean of its divisors is an integer number (1023840).

Almost surely, 2^13209985 is an apocalyptic number.

It is an amenable number.

13209985 is a deficient number, since it is larger than the sum of its proper divisors (3171455).

13209985 is an equidigital number, since it uses as much as digits as its factorization.

13209985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 13209985 is about 3634.5543055511. The cubic root of 13209985 is about 236.3927256425.

The spelling of 13209985 in words is "thirteen million, two hundred nine thousand, nine hundred eighty-five".