13902809 has 2 divisors, whose sum is σ = 13902810. Its totient is φ = 13902808.

The previous prime is 13902797. The next prime is 13902827. The reversal of 13902809 is 90820931.

13902809 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7038409 + 6864400 = 2653^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 13902809 - 2¹⁶ = 13837273 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13905809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6951404 + 6951405.

It is an arithmetic number, because the mean of its divisors is an integer number (6951405).

Almost surely, 2^13902809 is an apocalyptic number.

It is an amenable number.

13902809 is a deficient number, since it is larger than the sum of its proper divisors (1).

13902809 is an equidigital number, since it uses as much as digits as its factorization.

13902809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 13902809 is about 3728.6470736716. The cubic root of 13902809 is about 240.4552066680.

The spelling of 13902809 in words is "thirteen million, nine hundred two thousand, eight hundred nine".