23181372 has 18 divisors (see below), whose sum is σ = 58597448. Its totient is φ = 7727112.

The previous prime is 23181341. The next prime is 23181377. The reversal of 23181372 is 27318132.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23181377) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 321928 + ... + 321999.

Almost surely, 2^23181372 is an apocalyptic number.

It is an amenable number.

23181372 is an abundant number, since it is smaller than the sum of its proper divisors (35416076).

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

23181372 is a wasteful number, since it uses less digits than its factorization.

23181372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643937 (or 643932 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 23181372 is about 4814.7037292029. The cubic root of 23181372 is about 285.1322747024.

The spelling of 23181372 in words is "twenty-three million, one hundred eighty-one thousand, three hundred seventy-two".