23643240 has 64 divisors (see below), whose sum is σ = 71928000. Its totient is φ = 6216192.

The previous prime is 23643227. The next prime is 23643253. The reversal of 23643240 is 4234632.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23643227) and next prime (23643253).

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 23643240.

It is a congruent number.

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, 7411 + ... + 10109.

It is an arithmetic number, because the mean of its divisors is an integer number (1123875).

Almost surely, 2^23643240 is an apocalyptic number.

23643240 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 23643240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35964000).

23643240 is an abundant number, since it is smaller than the sum of its proper divisors (48284760).

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

23643240 is a wasteful number, since it uses less digits than its factorization.

23643240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786 (or 2782 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

The square root of 23643240 is about 4862.4314905199. The cubic root of 23643240 is about 287.0135036361.

Adding to 23643240 its reverse (4234632), we get a palindrome (27877872).

The spelling of 23643240 in words is "twenty-three million, six hundred forty-three thousand, two hundred forty".