23840172 has 18 divisors (see below), whose sum is σ = 60262748. Its totient is φ = 7946712.

The previous prime is 23840143. The next prime is 23840177. The reversal of 23840172 is 27104832.

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

It is not an unprimeable number, because it can be changed into a prime (23840177) 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, 331078 + ... + 331149.

Almost surely, 2^23840172 is an apocalyptic number.

It is an amenable number.

23840172 is an abundant number, since it is smaller than the sum of its proper divisors (36422576).

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

23840172 is a wasteful number, since it uses less digits than its factorization.

23840172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662237 (or 662232 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 23840172 is about 4882.6398597480. The cubic root of 23840172 is about 287.8081766620.

The spelling of 23840172 in words is "twenty-three million, eight hundred forty thousand, one hundred seventy-two".