243818172 has 72 divisors (see below), whose sum is σ = 666281616. Its totient is φ = 74732544.

The previous prime is 243818161. The next prime is 243818173. The reversal of 243818172 is 271818342.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243818173) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142828 + ... + 144524.

Almost surely, 2^243818172 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 243818172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333140808).

243818172 is an abundant number, since it is smaller than the sum of its proper divisors (422463444).

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

243818172 is a wasteful number, since it uses less digits than its factorization.

243818172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027 (or 2022 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 243818172 is about 15614.6780946646. The cubic root of 243818172 is about 624.7247188770.

The spelling of 243818172 in words is "two hundred forty-three million, eight hundred eighteen thousand, one hundred seventy-two".