923640 has 64 divisors (see below), whose sum is σ = 2851200. Its totient is φ = 239232.

The previous prime is 923617. The next prime is 923641. The reversal of 923640 is 46329.

It is a super-2 number, since 2×923640² = 1706221699200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 923640.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 923640.

It is not an unprimeable number, because it can be changed into a prime (923641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5071 + ... + 5249.

It is an arithmetic number, because the mean of its divisors is an integer number (44550).

2⁹²³⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 923640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1425600).

923640 is an abundant number, since it is smaller than the sum of its proper divisors (1927560).

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

923640 is a wasteful number, since it uses less digits than its factorization.

923640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 923640 is about 961.0619126778. The cubic root of 923640 is about 97.3869827876.

Adding to 923640 its reverse (46329), we get a palindrome (969969).

The spelling of 923640 in words is "nine hundred twenty-three thousand, six hundred forty".