23521432 has 48 divisors (see below), whose sum is σ = 49563720. Its totient is φ = 10464080.

The previous prime is 23521429. The next prime is 23521439. The reversal of 23521432 is 23412532.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

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

Its product of digits (1440) is a multiple of the sum of its prime divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23521439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 500433 + ... + 500479.

Almost surely, 2^23521432 is an apocalyptic number.

23521432 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 23521432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24781860).

23521432 is an abundant number, since it is smaller than the sum of its proper divisors (26042288).

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

23521432 is an equidigital number, since it uses as much as digits as its factorization.

23521432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 60 counting only the distinct ones).

The product of its digits is 1440, while the sum is 22.

The square root of 23521432 is about 4849.8898956574. The cubic root of 23521432 is about 286.5197648872.

Multiplying 23521432 by its sum of digits (22), we get a square (517471504 = 22748²).

23521432 divided by its sum of digits (22) gives a square (1069156 = 1034²).

Adding to 23521432 its reverse (23412532), we get a palindrome (46933964).

Subtracting from 23521432 its reverse (23412532), we obtain a square (108900 = 330²).

The spelling of 23521432 in words is "twenty-three million, five hundred twenty-one thousand, four hundred thirty-two".