23135640 has 128 divisors (see below), whose sum is σ = 80248320. Its totient is φ = 5273600.

The previous prime is 23135633. The next prime is 23135681. The reversal of 23135640 is 4653132.

It is a happy number.

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 23135640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21925 + ... + 22955.

It is an arithmetic number, because the mean of its divisors is an integer number (626940).

Almost surely, 2^23135640 is an apocalyptic number.

23135640 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 23135640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40124160).

23135640 is an abundant number, since it is smaller than the sum of its proper divisors (57112680).

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

23135640 is a wasteful number, since it uses less digits than its factorization.

23135640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073 (or 1069 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 23135640 is about 4809.9521827145. The cubic root of 23135640 is about 284.9446491462.

Adding to 23135640 its reverse (4653132), we get a palindrome (27788772).

The spelling of 23135640 in words is "twenty-three million, one hundred thirty-five thousand, six hundred forty".