243980 has 24 divisors (see below), whose sum is σ = 559440. Its totient is φ = 88640.

The previous prime is 243973. The next prime is 243989. The reversal of 243980 is 89342.

243980 = T₂₆ + T₂₇ + ... + T₁₁₃.

243980 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 (243989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335 + ... + 774.

It is an arithmetic number, because the mean of its divisors is an integer number (23310).

2²⁴³⁹⁸⁰ is an apocalyptic number.

243980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243980 is an abundant number, since it is smaller than the sum of its proper divisors (315460).

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

243980 is a wasteful number, since it uses less digits than its factorization.

243980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129 (or 1127 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 243980 is about 493.9433165860. The cubic root of 243980 is about 62.4862903263.

It can be divided in two parts, 24 and 3980, that added together give a palindrome (4004).

The spelling of 243980 in words is "two hundred forty-three thousand, nine hundred eighty".