23639240 has 32 divisors (see below), whose sum is σ = 53396280. Its totient is φ = 9418752.

The previous prime is 23639233. The next prime is 23639243. The reversal of 23639240 is 4293632.

It can be written as a sum of positive squares in 4 ways, for example, as 23639044 + 196 = 4862^2 + 14^2 .

It is not an unprimeable number, because it can be changed into a prime (23639243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10712 + ... + 12728.

Almost surely, 2^23639240 is an apocalyptic number.

23639240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23639240 is an abundant number, since it is smaller than the sum of its proper divisors (29757040).

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

23639240 is a wasteful number, since it uses less digits than its factorization.

23639240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2321 (or 2317 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 23639240 is about 4862.0201562725. The cubic root of 23639240 is about 286.9973169267.

The spelling of 23639240 in words is "twenty-three million, six hundred thirty-nine thousand, two hundred forty".