13287409 has 4 divisors (see below), whose sum is σ = 13304304. Its totient is φ = 13270516.

The previous prime is 13287397. The next prime is 13287451. The reversal of 13287409 is 90478231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13287409 - 2⁵ = 13287377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13267409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7207 + ... + 8860.

It is an arithmetic number, because the mean of its divisors is an integer number (3326076).

Almost surely, 2^13287409 is an apocalyptic number.

It is an amenable number.

13287409 is a deficient number, since it is larger than the sum of its proper divisors (16895).

13287409 is an equidigital number, since it uses as much as digits as its factorization.

13287409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16894.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 13287409 is about 3645.1898441645. The cubic root of 13287409 is about 236.8536605417.

The spelling of 13287409 in words is "thirteen million, two hundred eighty-seven thousand, four hundred nine".