243280 has 20 divisors (see below), whose sum is σ = 565812. Its totient is φ = 97280.

The previous prime is 243263. The next prime is 243301. The reversal of 243280 is 82342.

It is a happy number.

243280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 179776 + 63504 = 424^2 + 252^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1441 + ... + 1600.

2²⁴³²⁸⁰ is an apocalyptic number.

243280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243280 is an abundant number, since it is smaller than the sum of its proper divisors (322532).

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

243280 is a wasteful number, since it uses less digits than its factorization.

243280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054 (or 3048 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 243280 is about 493.2342242789. The cubic root of 243280 is about 62.4264735357.

Multiplying 243280 by its sum of digits (19), we get a triangular number (4622320 = T₃₀₄₀).

The spelling of 243280 in words is "two hundred forty-three thousand, two hundred eighty".