13420809 has 20 divisors (see below), whose sum is σ = 20165376. Its totient is φ = 8895096.

The previous prime is 13420807. The next prime is 13420873. The reversal of 13420809 is 90802431.

It is not a de Polignac number, because 13420809 - 2¹ = 13420807 is a prime.

It is a super-2 number, since 2×13420809² = 360236228428962, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13420801) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17692 + ... + 18434.

Almost surely, 2^13420809 is an apocalyptic number.

It is an amenable number.

13420809 is a deficient number, since it is larger than the sum of its proper divisors (6744567).

13420809 is an equidigital number, since it uses as much as digits as its factorization.

13420809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978 (or 969 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 13420809 is about 3663.4422337468. The cubic root of 13420809 is about 237.6436597149.

The spelling of 13420809 in words is "thirteen million, four hundred twenty thousand, eight hundred nine".