23452440 has 128 divisors (see below), whose sum is σ = 77932800. Its totient is φ = 5598720.

The previous prime is 23452427. The next prime is 23452477. The reversal of 23452440 is 4425432.

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 23452440.

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 31 ways as a sum of consecutive naturals, for example, 143799 + ... + 143961.

It is an arithmetic number, because the mean of its divisors is an integer number (608850).

Almost surely, 2^23452440 is an apocalyptic number.

23452440 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 23452440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38966400).

23452440 is an abundant number, since it is smaller than the sum of its proper divisors (54480360).

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

23452440 is a wasteful number, since it uses less digits than its factorization.

23452440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 23452440 is about 4842.7719335108. The cubic root of 23452440 is about 286.2393549432.

Adding to 23452440 its reverse (4425432), we get a palindrome (27877872).

The spelling of 23452440 in words is "twenty-three million, four hundred fifty-two thousand, four hundred forty".