23540809 has 2 divisors, whose sum is σ = 23540810. Its totient is φ = 23540808.

The previous prime is 23540773. The next prime is 23540819. The reversal of 23540809 is 90804532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21206025 + 2334784 = 4605^2 + 1528^2 .

It is a cyclic number.

It is not a de Polignac number, because 23540809 - 2⁷ = 23540681 is a prime.

It is not a weakly prime, because it can be changed into another prime (23540819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11770404 + 11770405.

It is an arithmetic number, because the mean of its divisors is an integer number (11770405).

Almost surely, 2^23540809 is an apocalyptic number.

It is an amenable number.

23540809 is a deficient number, since it is larger than the sum of its proper divisors (1).

23540809 is an equidigital number, since it uses as much as digits as its factorization.

23540809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 23540809 is about 4851.8871586219. The cubic root of 23540809 is about 286.5984217993.

The spelling of 23540809 in words is "twenty-three million, five hundred forty thousand, eight hundred nine".