23133840 has 80 divisors (see below), whose sum is σ = 73495296. Its totient is φ = 6016000.

The previous prime is 23133839. The next prime is 23133853. The reversal of 23133840 is 4833132.

It is a tau number, because it is divible by the number of its divisors (80).

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 23133840.

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, 8665 + ... + 11015.

Almost surely, 2^23133840 is an apocalyptic number.

23133840 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 23133840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36747648).

23133840 is an abundant number, since it is smaller than the sum of its proper divisors (50361456).

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

23133840 is a wasteful number, since it uses less digits than its factorization.

23133840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408 (or 2402 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 23133840 is about 4809.7650670277. The cubic root of 23133840 is about 284.9372591961.

Adding to 23133840 its reverse (4833132), we get a palindrome (27966972).

The spelling of 23133840 in words is "twenty-three million, one hundred thirty-three thousand, eight hundred forty".