40293809 has 2 divisors, whose sum is σ = 40293810. Its totient is φ = 40293808.

The previous prime is 40293697. The next prime is 40293887. The reversal of 40293809 is 90839204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 19998784 = 4505^2 + 4472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40293809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40293109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20146904 + 20146905.

It is an arithmetic number, because the mean of its divisors is an integer number (20146905).

Almost surely, 2^40293809 is an apocalyptic number.

It is an amenable number.

40293809 is a deficient number, since it is larger than the sum of its proper divisors (1).

40293809 is an equidigital number, since it uses as much as digits as its factorization.

40293809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 40293809 is about 6347.7404641337. The cubic root of 40293809 is about 342.8304913725.

The spelling of 40293809 in words is "forty million, two hundred ninety-three thousand, eight hundred nine".