13813209 has 12 divisors (see below), whose sum is σ = 21002800. Its totient is φ = 8724024.

The previous prime is 13813207. The next prime is 13813211. The reversal of 13813209 is 90231831.

It is an interprime number because it is at equal distance from previous prime (13813207) and next prime (13813211).

It is not a de Polignac number, because 13813209 - 2¹ = 13813207 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13813201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40219 + ... + 40560.

Almost surely, 2^13813209 is an apocalyptic number.

13813209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

13813209 is a deficient number, since it is larger than the sum of its proper divisors (7189591).

13813209 is a wasteful number, since it uses less digits than its factorization.

13813209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80804 (or 80801 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 13813209 is about 3716.6125706078. The cubic root of 13813209 is about 239.9375358274.

The spelling of 13813209 in words is "thirteen million, eight hundred thirteen thousand, two hundred nine".