23928440 has 32 divisors (see below), whose sum is σ = 54859680. Its totient is φ = 9389952.

The previous prime is 23928419. The next prime is 23928449. The reversal of 23928440 is 4482932.

It is a junction number, because it is equal to n+sod(n) for n = 23928397 and 23928406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23928449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3524 + ... + 7763.

It is an arithmetic number, because the mean of its divisors is an integer number (1714365).

Almost surely, 2^23928440 is an apocalyptic number.

23928440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23928440 is an abundant number, since it is smaller than the sum of its proper divisors (30931240).

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

23928440 is a wasteful number, since it uses less digits than its factorization.

23928440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11351 (or 11347 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 23928440 is about 4891.6704713216. The cubic root of 23928440 is about 288.1629414888.

The spelling of 23928440 in words is "twenty-three million, nine hundred twenty-eight thousand, four hundred forty".