23790421 has 2 divisors, whose sum is σ = 23790422. Its totient is φ = 23790420.

The previous prime is 23790419. The next prime is 23790433. The reversal of 23790421 is 12409732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23280625 + 509796 = 4825^2 + 714^2 .

It is a cyclic number.

It is not a de Polignac number, because 23790421 - 2¹ = 23790419 is a prime.

Together with 23790419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 23790421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23790491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11895210 + 11895211.

It is an arithmetic number, because the mean of its divisors is an integer number (11895211).

Almost surely, 2^23790421 is an apocalyptic number.

It is an amenable number.

23790421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23790421 is an equidigital number, since it uses as much as digits as its factorization.

23790421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 23790421 is about 4877.5425164728. The cubic root of 23790421 is about 287.6078325181.

The spelling of 23790421 in words is "twenty-three million, seven hundred ninety thousand, four hundred twenty-one".