13873209 has 16 divisors (see below), whose sum is σ = 22060032. Its totient is φ = 7582608.

The previous prime is 13873183. The next prime is 13873217. The reversal of 13873209 is 90237831.

13873209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13873209 - 2⁵ = 13873177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13873209.

It is not an unprimeable number, because it can be changed into a prime (13873229) 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, 13879 + ... + 14844.

It is an arithmetic number, because the mean of its divisors is an integer number (1378752).

Almost surely, 2^13873209 is an apocalyptic number.

It is an amenable number.

13873209 is a deficient number, since it is larger than the sum of its proper divisors (8186823).

13873209 is a wasteful number, since it uses less digits than its factorization.

13873209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28756.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 13873209 is about 3724.6756905803. The cubic root of 13873209 is about 240.2844370705.

The spelling of 13873209 in words is "thirteen million, eight hundred seventy-three thousand, two hundred nine".