23643840 has 112 divisors (see below), whose sum is σ = 81930240. Its totient is φ = 5729280.

The previous prime is 23643833. The next prime is 23643863. The reversal of 23643840 is 4834632.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 23643798 and 23643807.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9441 + ... + 11679.

It is an arithmetic number, because the mean of its divisors is an integer number (731520).

Almost surely, 2^23643840 is an apocalyptic number.

23643840 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 23643840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40965120).

23643840 is an abundant number, since it is smaller than the sum of its proper divisors (58286400).

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

23643840 is a wasteful number, since it uses less digits than its factorization.

23643840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270 (or 2260 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 23643840 is about 4862.4931876559. The cubic root of 23643840 is about 287.0159314850.

The spelling of 23643840 in words is "twenty-three million, six hundred forty-three thousand, eight hundred forty".