23772809 has 2 divisors, whose sum is σ = 23772810. Its totient is φ = 23772808.

The previous prime is 23772799. The next prime is 23772821. The reversal of 23772809 is 90827732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 3097600 = 4547^2 + 1760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23772809 is a prime.

It is not a weakly prime, because it can be changed into another prime (23772829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11886404 + 11886405.

It is an arithmetic number, because the mean of its divisors is an integer number (11886405).

Almost surely, 2^23772809 is an apocalyptic number.

It is an amenable number.

23772809 is a deficient number, since it is larger than the sum of its proper divisors (1).

23772809 is an equidigital number, since it uses as much as digits as its factorization.

23772809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 23772809 is about 4875.7367648387. The cubic root of 23772809 is about 287.5368431674.

The spelling of 23772809 in words is "twenty-three million, seven hundred seventy-two thousand, eight hundred nine".