23993621 has 2 divisors, whose sum is σ = 23993622. Its totient is φ = 23993620.

The previous prime is 23993617. The next prime is 23993633. The reversal of 23993621 is 12639932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 819025 = 4814^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 23993621 - 2² = 23993617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23993821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11996810 + 11996811.

It is an arithmetic number, because the mean of its divisors is an integer number (11996811).

Almost surely, 2^23993621 is an apocalyptic number.

It is an amenable number.

23993621 is a deficient number, since it is larger than the sum of its proper divisors (1).

23993621 is an equidigital number, since it uses as much as digits as its factorization.

23993621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 35.

The square root of 23993621 is about 4898.3283883382. The cubic root of 23993621 is about 288.4243559358.

The spelling of 23993621 in words is "twenty-three million, nine hundred ninety-three thousand, six hundred twenty-one".