23223640 has 64 divisors (see below), whose sum is σ = 58268160. Its totient is φ = 8257920.

The previous prime is 23223559. The next prime is 23223667. The reversal of 23223640 is 4632232.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 20119 + ... + 21241.

It is an arithmetic number, because the mean of its divisors is an integer number (910440).

Almost surely, 2^23223640 is an apocalyptic number.

23223640 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 23223640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29134080).

23223640 is an abundant number, since it is smaller than the sum of its proper divisors (35044520).

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

23223640 is a wasteful number, since it uses less digits than its factorization.

23223640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1188 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 23223640 is about 4819.0912006311. The cubic root of 23223640 is about 285.3054691300.

Adding to 23223640 its reverse (4632232), we get a palindrome (27855872).

The spelling of 23223640 in words is "twenty-three million, two hundred twenty-three thousand, six hundred forty".