23404781 has 2 divisors, whose sum is σ = 23404782. Its totient is φ = 23404780.

The previous prime is 23404763. The next prime is 23404813. The reversal of 23404781 is 18740432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 27556 = 4835^2 + 166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23404781 is a prime.

It is a super-2 number, since 2×23404781² = 1095567547315922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23404741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11702390 + 11702391.

It is an arithmetic number, because the mean of its divisors is an integer number (11702391).

Almost surely, 2^23404781 is an apocalyptic number.

It is an amenable number.

23404781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23404781 is an equidigital number, since it uses as much as digits as its factorization.

23404781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 23404781 is about 4837.8487987948. The cubic root of 23404781 is about 286.0453291805.

The spelling of 23404781 in words is "twenty-three million, four hundred four thousand, seven hundred eighty-one".