13240409 has 16 divisors (see below), whose sum is σ = 16501632. Its totient is φ = 10343808.

The previous prime is 13240391. The next prime is 13240421. The reversal of 13240409 is 90404231.

It is a cyclic number.

It is not a de Polignac number, because 13240409 - 2¹² = 13236313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13240459) 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, 6677 + ... + 8429.

It is an arithmetic number, because the mean of its divisors is an integer number (1031352).

Almost surely, 2^13240409 is an apocalyptic number.

It is an amenable number.

13240409 is a deficient number, since it is larger than the sum of its proper divisors (3261223).

13240409 is a wasteful number, since it uses less digits than its factorization.

13240409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 13240409 is about 3638.7372809809. The cubic root of 13240409 is about 236.5740656924.

The spelling of 13240409 in words is "thirteen million, two hundred forty thousand, four hundred nine".