23640012 has 126 divisors (see below), whose sum is σ = 69195644. Its totient is φ = 7056720.

The previous prime is 23639999. The next prime is 23640037. The reversal of 23640012 is 21004632.

It is a happy number.

23640012 is a `hidden beast` number, since 23 + 640 + 0 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 352803 + ... + 352869.

Almost surely, 2^23640012 is an apocalyptic number.

23640012 is a gapful number since it is divisible by the number (22) 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 23640012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34597822).

23640012 is an abundant number, since it is smaller than the sum of its proper divisors (45555632).

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

23640012 is a wasteful number, since it uses less digits than its factorization.

23640012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 23640012 is about 4862.0995464922. The cubic root of 23640012 is about 287.0004411038. Note that the first 3 decimals are identical.

Adding to 23640012 its reverse (21004632), we get a palindrome (44644644).

The spelling of 23640012 in words is "twenty-three million, six hundred forty thousand, twelve".