23023440 has 400 divisors, whose sum is σ = 97225920. Its totient is φ = 4976640.

The previous prime is 23023439. The next prime is 23023463. The reversal of 23023440 is 4432032.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1211751 + ... + 1211769.

Almost surely, 2^23023440 is an apocalyptic number.

23023440 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 23023440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48612960).

23023440 is an abundant number, since it is smaller than the sum of its proper divisors (74202480).

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

23023440 is a wasteful number, since it uses less digits than its factorization.

23023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 23023440 is about 4798.2746899276. The cubic root of 23023440 is about 284.4832742310.

Adding to 23023440 its reverse (4432032), we get a palindrome (27455472).

The spelling of 23023440 in words is "twenty-three million, twenty-three thousand, four hundred forty".