243620 has 24 divisors (see below), whose sum is σ = 551544. Its totient is φ = 89856.

The previous prime is 243613. The next prime is 243623. The reversal of 243620 is 26342.

It can be written as a sum of positive squares in 4 ways, for example, as 5476 + 238144 = 74^2 + 488^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243620.

It is not an unprimeable number, because it can be changed into a prime (243623) by changing a digit.

243620 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209 + ... + 728.

It is an arithmetic number, because the mean of its divisors is an integer number (22981).

2²⁴³⁶²⁰ is an apocalyptic number.

243620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243620 is an abundant number, since it is smaller than the sum of its proper divisors (307924).

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

243620 is a wasteful number, since it uses less digits than its factorization.

243620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959 (or 957 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 243620 is about 493.5787677767. The cubic root of 243620 is about 62.4555417162.

Adding to 243620 its reverse (26342), we get a palindrome (269962).

The spelling of 243620 in words is "two hundred forty-three thousand, six hundred twenty".