243969380 has 96 divisors (see below), whose sum is σ = 568995840. Its totient is φ = 87459840.

The previous prime is 243969377. The next prime is 243969389. The reversal of 243969380 is 83969342.

243969380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (243969389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 832514 + ... + 832806.

It is an arithmetic number, because the mean of its divisors is an integer number (5927040).

Almost surely, 2^243969380 is an apocalyptic number.

243969380 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 243969380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284497920).

243969380 is an abundant number, since it is smaller than the sum of its proper divisors (325026460).

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

243969380 is a wasteful number, since it uses less digits than its factorization.

243969380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 243969380 is about 15619.5191987462. The cubic root of 243969380 is about 624.8538367541.

The spelling of 243969380 in words is "two hundred forty-three million, nine hundred sixty-nine thousand, three hundred eighty".