243836240 has 20 divisors (see below), whose sum is σ = 566919444. Its totient is φ = 97534464.

The previous prime is 243836239. The next prime is 243836251. The reversal of 243836240 is 42638342.

It can be written as a sum of positive squares in 2 ways, for example, as 80712256 + 163123984 = 8984^2 + 12772^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×243836240² = 118912223874675200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243836197 and 243836206.

It is a congruent number.

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 1523897 + ... + 1524056.

Almost surely, 2^243836240 is an apocalyptic number.

243836240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243836240 is an abundant number, since it is smaller than the sum of its proper divisors (323083204).

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

243836240 is a wasteful number, since it uses less digits than its factorization.

243836240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047966 (or 3047960 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 243836240 is about 15615.2566421433. The cubic root of 243836240 is about 624.7401501132.

The spelling of 243836240 in words is "two hundred forty-three million, eight hundred thirty-six thousand, two hundred forty".