8013809 has 2 divisors, whose sum is σ = 8013810. Its totient is φ = 8013808.

The previous prime is 8013799. The next prime is 8013857. The reversal of 8013809 is 9083108.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7139584 + 874225 = 2672^2 + 935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8013809 is a prime.

It is a super-2 number, since 2×8013809² = 128442269376962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8013869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4006904 + 4006905.

It is an arithmetic number, because the mean of its divisors is an integer number (4006905).

Almost surely, 2^8013809 is an apocalyptic number.

It is an amenable number.

8013809 is a deficient number, since it is larger than the sum of its proper divisors (1).

8013809 is an equidigital number, since it uses as much as digits as its factorization.

8013809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 8013809 is about 2830.8671816247. The cubic root of 8013809 is about 200.1150088521.

The spelling of 8013809 in words is "eight million, thirteen thousand, eight hundred nine".