243155320 has 64 divisors (see below), whose sum is σ = 568800000. Its totient is φ = 93450240.

The previous prime is 243155317. The next prime is 243155323. The reversal of 243155320 is 23551342.

It is an interprime number because it is at equal distance from previous prime (243155317) and next prime (243155323).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243155323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194056 + ... + 195304.

It is an arithmetic number, because the mean of its divisors is an integer number (8887500).

Almost surely, 2^243155320 is an apocalyptic number.

243155320 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 243155320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284400000).

243155320 is an abundant number, since it is smaller than the sum of its proper divisors (325644680).

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

243155320 is a wasteful number, since it uses less digits than its factorization.

243155320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448 (or 1444 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 243155320 is about 15593.4383636195. The cubic root of 243155320 is about 624.1580727629.

The spelling of 243155320 in words is "two hundred forty-three million, one hundred fifty-five thousand, three hundred twenty".