23921812 has 6 divisors (see below), whose sum is σ = 41863178. Its totient is φ = 11960904.

The previous prime is 23921789. The next prime is 23921813. The reversal of 23921812 is 21812932.

It can be written as a sum of positive squares in only one way, i.e., 16760836 + 7160976 = 4094^2 + 2676^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23921813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2990223 + ... + 2990230.

Almost surely, 2^23921812 is an apocalyptic number.

It is an amenable number.

23921812 is a deficient number, since it is larger than the sum of its proper divisors (17941366).

23921812 is a wasteful number, since it uses less digits than its factorization.

23921812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5980457 (or 5980455 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 23921812 is about 4890.9929462227. The cubic root of 23921812 is about 288.1363327009.

The spelling of 23921812 in words is "twenty-three million, nine hundred twenty-one thousand, eight hundred twelve".