23903621 has 6 divisors (see below), whose sum is σ = 27806310. Its totient is φ = 20488776.

The previous prime is 23903617. The next prime is 23903639. The reversal of 23903621 is 12630932.

It can be written as a sum of positive squares in only one way, i.e., 23872996 + 30625 = 4886^2 + 175^2 .

It is not a de Polignac number, because 23903621 - 2² = 23903617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23903021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 243866 + ... + 243963.

It is an arithmetic number, because the mean of its divisors is an integer number (4634385).

Almost surely, 2^23903621 is an apocalyptic number.

It is an amenable number.

23903621 is a deficient number, since it is larger than the sum of its proper divisors (3902689).

23903621 is an equidigital number, since it uses as much as digits as its factorization.

23903621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487843 (or 487836 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 23903621 is about 4889.1329497161. The cubic root of 23903621 is about 288.0632777947.

The spelling of 23903621 in words is "twenty-three million, nine hundred three thousand, six hundred twenty-one".