23726821 has 2 divisors, whose sum is σ = 23726822. Its totient is φ = 23726820.

The previous prime is 23726803. The next prime is 23726831. The reversal of 23726821 is 12862732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20802721 + 2924100 = 4561^2 + 1710^2 .

It is a cyclic number.

It is not a de Polignac number, because 23726821 - 2⁷ = 23726693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23726831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11863410 + 11863411.

It is an arithmetic number, because the mean of its divisors is an integer number (11863411).

Almost surely, 2^23726821 is an apocalyptic number.

It is an amenable number.

23726821 is a deficient number, since it is larger than the sum of its proper divisors (1).

23726821 is an equidigital number, since it uses as much as digits as its factorization.

23726821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 23726821 is about 4871.0184766638. The cubic root of 23726821 is about 287.3513121515.

The spelling of 23726821 in words is "twenty-three million, seven hundred twenty-six thousand, eight hundred twenty-one".