23926421 has 4 divisors (see below), whose sum is σ = 24751500. Its totient is φ = 23101344.

The previous prime is 23926391. The next prime is 23926423. The reversal of 23926421 is 12462932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8236900 + 15689521 = 2870^2 + 3961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23926421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 825049 = 23926421 / (2 + 3 + 9 + 2 + 6 + 4 + 2 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23926423) 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 in 3 ways as a sum of consecutive naturals, for example, 412496 + ... + 412553.

It is an arithmetic number, because the mean of its divisors is an integer number (6187875).

Almost surely, 2^23926421 is an apocalyptic number.

It is an amenable number.

23926421 is a deficient number, since it is larger than the sum of its proper divisors (825079).

23926421 is an equidigital number, since it uses as much as digits as its factorization.

23926421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825078.

The product of its digits is 5184, while the sum is 29.

The square root of 23926421 is about 4891.4640957488. The cubic root of 23926421 is about 288.1548365260.

The spelling of 23926421 in words is "twenty-three million, nine hundred twenty-six thousand, four hundred twenty-one".