23502440 has 32 divisors (see below), whose sum is σ = 56949480. Its totient is φ = 8677632.

The previous prime is 23502439. The next prime is 23502463. The reversal of 23502440 is 4420532.

It can be written as a sum of positive squares in 4 ways, for example, as 20124196 + 3378244 = 4486^2 + 1838^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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 7 ways as a sum of consecutive naturals, for example, 22079 + ... + 23118.

Almost surely, 2^23502440 is an apocalyptic number.

23502440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23502440 is an abundant number, since it is smaller than the sum of its proper divisors (33447040).

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

23502440 is a wasteful number, since it uses less digits than its factorization.

23502440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45221 (or 45217 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 23502440 is about 4847.9315176681. The cubic root of 23502440 is about 286.4426288720.

Adding to 23502440 its reverse (4420532), we get a palindrome (27922972).

The spelling of 23502440 in words is "twenty-three million, five hundred two thousand, four hundred forty".