10040809 has 2 divisors, whose sum is σ = 10040810. Its totient is φ = 10040808.

The previous prime is 10040791. The next prime is 10040819. The reversal of 10040809 is 90804001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6250000 + 3790809 = 2500^2 + 1947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10040809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10040809.

It is not a weakly prime, because it can be changed into another prime (10040819) 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 as a sum of consecutive naturals, namely, 5020404 + 5020405.

It is an arithmetic number, because the mean of its divisors is an integer number (5020405).

Almost surely, 2^10040809 is an apocalyptic number.

It is an amenable number.

10040809 is a deficient number, since it is larger than the sum of its proper divisors (1).

10040809 is an equidigital number, since it uses as much as digits as its factorization.

10040809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 10040809 is about 3168.7235600475. The cubic root of 10040809 is about 215.7361389954.

The spelling of 10040809 in words is "ten million, forty thousand, eight hundred nine".