23043840 has 144 divisors (see below), whose sum is σ = 78146208. Its totient is φ = 5767168.

The previous prime is 23043833. The next prime is 23043863. The reversal of 23043840 is 4834032.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 23043840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65104 + ... + 65456.

It is an arithmetic number, because the mean of its divisors is an integer number (542682).

Almost surely, 2^23043840 is an apocalyptic number.

23043840 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 23043840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39073104).

23043840 is an abundant number, since it is smaller than the sum of its proper divisors (55102368).

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

23043840 is a wasteful number, since it uses less digits than its factorization.

23043840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 23043840 is about 4800.3999833347. The cubic root of 23043840 is about 284.5672718957.

Adding to 23043840 its reverse (4834032), we get a palindrome (27877872).

The spelling of 23043840 in words is "twenty-three million, forty-three thousand, eight hundred forty".