243244980 has 144 divisors (see below), whose sum is σ = 823927104. Its totient is φ = 57576960.

The previous prime is 243244957. The next prime is 243244997. The reversal of 243244980 is 89442342.

243244980 = 468² + 469² + ... + 940².

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83712 + ... + 86568.

It is an arithmetic number, because the mean of its divisors is an integer number (5721716).

Almost surely, 2^243244980 is an apocalyptic number.

243244980 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 243244980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411963552).

243244980 is an abundant number, since it is smaller than the sum of its proper divisors (580682124).

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

243244980 is a wasteful number, since it uses less digits than its factorization.

243244980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926 (or 2921 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 243244980 is about 15596.3130258404. The cubic root of 243244980 is about 624.2347797498.

The spelling of 243244980 in words is "two hundred forty-three million, two hundred forty-four thousand, nine hundred eighty".