243400 has 24 divisors (see below), whose sum is σ = 566370. Its totient is φ = 97280.

The previous prime is 243391. The next prime is 243401. The reversal of 243400 is 4342.

It can be written as a sum of positive squares in 3 ways, for example, as 161604 + 81796 = 402^2 + 286^2 .

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409 + ... + 808.

2²⁴³⁴⁰⁰ is an apocalyptic number.

243400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243400 is an abundant number, since it is smaller than the sum of its proper divisors (322970).

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

243400 is a wasteful number, since it uses less digits than its factorization.

243400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233 (or 1224 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 243400 is about 493.3558553418. The cubic root of 243400 is about 62.4367359842.

Adding to 243400 its reverse (4342), we get a palindrome (247742).

The spelling of 243400 in words is "two hundred forty-three thousand, four hundred", and thus it is an iban number.