23644040 has 32 divisors (see below), whose sum is σ = 60799680. Its totient is φ = 8106432.

The previous prime is 23644013. The next prime is 23644051. The reversal of 23644040 is 4044632.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 23643997 and 23644015.

It is an unprimeable number.

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, 41942 + ... + 42501.

It is an arithmetic number, because the mean of its divisors is an integer number (1899990).

Almost surely, 2^23644040 is an apocalyptic number.

23644040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23644040 is an abundant number, since it is smaller than the sum of its proper divisors (37155640).

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

23644040 is a wasteful number, since it uses less digits than its factorization.

23644040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84461 (or 84457 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 23644040 is about 4862.5137531939. The cubic root of 23644040 is about 287.0167407589.

Adding to 23644040 its reverse (4044632), we get a palindrome (27688672).

The spelling of 23644040 in words is "twenty-three million, six hundred forty-four thousand, forty".