243988 has 12 divisors (see below), whose sum is σ = 430612. Its totient is φ = 120960.

The previous prime is 243973. The next prime is 243989. The reversal of 243988 is 889342.

243988 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 24964 + 219024 = 158^2 + 468^2 .

It is a d-powerful number, because it can be written as 2¹⁵ + 4³ + 9³ + 3¹¹ + 8³ + 8⁵ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243989) by changing a digit.

243988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556 + ... + 892.

2²⁴³⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

243988 is a deficient number, since it is larger than the sum of its proper divisors (186624).

243988 is a wasteful number, since it uses less digits than its factorization.

243988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 520 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 243988 is about 493.9514146148. The cubic root of 243988 is about 62.4869732851.

The spelling of 243988 in words is "two hundred forty-three thousand, nine hundred eighty-eight".