13406409 has 24 divisors (see below), whose sum is σ = 19891872. Its totient is φ = 8698560.

The previous prime is 13406389. The next prime is 13406417. The reversal of 13406409 is 90460431.

13406409 is a `hidden beast` number, since 13 + 4 + 0 + 640 + 9 = 666.

It is not a de Polignac number, because 13406409 - 2⁹ = 13405897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13406429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97789 + ... + 97925.

It is an arithmetic number, because the mean of its divisors is an integer number (828828).

Almost surely, 2^13406409 is an apocalyptic number.

It is an amenable number.

13406409 is a deficient number, since it is larger than the sum of its proper divisors (6485463).

13406409 is a wasteful number, since it uses less digits than its factorization.

13406409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 13406409 is about 3661.4763415868. The cubic root of 13406409 is about 237.5586351995.

The spelling of 13406409 in words is "thirteen million, four hundred six thousand, four hundred nine".