243212040 has 96 divisors (see below), whose sum is σ = 798384600. Its totient is φ = 64204800.

The previous prime is 243212023. The next prime is 243212083. The reversal of 243212040 is 40212342.

It can be written as a sum of positive squares in 4 ways, for example, as 243172836 + 39204 = 15594^2 + 198^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33016 + ... + 39704.

Almost surely, 2^243212040 is an apocalyptic number.

243212040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243212040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (399192300).

243212040 is an abundant number, since it is smaller than the sum of its proper divisors (555172560).

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

243212040 is a wasteful number, since it uses less digits than its factorization.

243212040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6807 (or 6800 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 243212040 is about 15595.2569712717. The cubic root of 243212040 is about 624.2066007210.

Adding to 243212040 its reverse (40212342), we get a palindrome (283424382).

The spelling of 243212040 in words is "two hundred forty-three million, two hundred twelve thousand, forty".