23921040 has 320 divisors, whose sum is σ = 94493952. Its totient is φ = 4915200.

The previous prime is 23921017. The next prime is 23921047. The reversal of 23921040 is 4012932.

It is a junction number, because it is equal to n+sod(n) for n = 23920998 and 23921016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23921047) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 583420 + ... + 583460.

Almost surely, 2^23921040 is an apocalyptic number.

23921040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23921040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47246976).

23921040 is an abundant number, since it is smaller than the sum of its proper divisors (70572912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23921040 is a wasteful number, since it uses less digits than its factorization.

23921040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 23921040 is about 4890.9140250060. The cubic root of 23921040 is about 288.1332331080.

Adding to 23921040 its reverse (4012932), we get a palindrome (27933972).

The spelling of 23921040 in words is "twenty-three million, nine hundred twenty-one thousand, forty".