13864809 has 32 divisors (see below), whose sum is σ = 22726656. Its totient is φ = 7338240.

The previous prime is 13864801. The next prime is 13864819. The reversal of 13864809 is 90846831.

13864809 = T₄₂₂ + T₄₂₃ + ... + T₅₄₀.

It is not a de Polignac number, because 13864809 - 2³ = 13864801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13864801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25074 + ... + 25620.

It is an arithmetic number, because the mean of its divisors is an integer number (710208).

Almost surely, 2^13864809 is an apocalyptic number.

It is an amenable number.

13864809 is a deficient number, since it is larger than the sum of its proper divisors (8861847).

13864809 is a wasteful number, since it uses less digits than its factorization.

13864809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 13864809 is about 3723.5479048886. The cubic root of 13864809 is about 240.2359311871.

The spelling of 13864809 in words is "thirteen million, eight hundred sixty-four thousand, eight hundred nine".