40799809 has 2 divisors, whose sum is σ = 40799810. Its totient is φ = 40799808.

The previous prime is 40799777. The next prime is 40799867. The reversal of 40799809 is 90899704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29942784 + 10857025 = 5472^2 + 3295^2 .

It is a cyclic number.

It is not a de Polignac number, because 40799809 - 2⁵ = 40799777 is a prime.

It is not a weakly prime, because it can be changed into another prime (40799509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20399904 + 20399905.

It is an arithmetic number, because the mean of its divisors is an integer number (20399905).

Almost surely, 2^40799809 is an apocalyptic number.

It is an amenable number.

40799809 is a deficient number, since it is larger than the sum of its proper divisors (1).

40799809 is an equidigital number, since it uses as much as digits as its factorization.

40799809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 40799809 is about 6387.4728179461. The cubic root of 40799809 is about 344.2595869411.

The spelling of 40799809 in words is "forty million, seven hundred ninety-nine thousand, eight hundred nine".