243347820 has 96 divisors (see below), whose sum is σ = 748500480. Its totient is φ = 58798080.

The previous prime is 243347813. The next prime is 243347831. The reversal of 243347820 is 28743342.

243347820 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×243347820² = 118436322997504800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21580 + ... + 30860.

It is an arithmetic number, because the mean of its divisors is an integer number (7796880).

Almost surely, 2^243347820 is an apocalyptic number.

243347820 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 243347820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374250240).

243347820 is an abundant number, since it is smaller than the sum of its proper divisors (505152660).

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

243347820 is a wasteful number, since it uses less digits than its factorization.

243347820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9335 (or 9333 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 243347820 is about 15599.6096104999. The cubic root of 243347820 is about 624.3227394408.

The spelling of 243347820 in words is "two hundred forty-three million, three hundred forty-seven thousand, eight hundred twenty".