13408509 has 16 divisors (see below), whose sum is σ = 19105280. Its totient is φ = 8339760.

The previous prime is 13408501. The next prime is 13408511. The reversal of 13408509 is 90580431.

It is not a de Polignac number, because 13408509 - 2³ = 13408501 is a prime.

It is a super-2 number, since 2×13408509² = 359576227206162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13408501) 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, 2064 + ... + 5574.

It is an arithmetic number, because the mean of its divisors is an integer number (1194080).

Almost surely, 2^13408509 is an apocalyptic number.

13408509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

13408509 is a deficient number, since it is larger than the sum of its proper divisors (5696771).

13408509 is a wasteful number, since it uses less digits than its factorization.

13408509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 13408509 is about 3661.7630999288. The cubic root of 13408509 is about 237.5710383988.

The spelling of 13408509 in words is "thirteen million, four hundred eight thousand, five hundred nine".