243246240 has 180 divisors, whose sum is σ = 864768366. Its totient is φ = 64392192.

The previous prime is 243246233. The next prime is 243246277. The reversal of 243246240 is 42642342.

243246240 is a `hidden beast` number, since 2 + 4 + 32 + 4 + 624 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 210482064 + 32764176 = 14508^2 + 5724^2 .

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1775452 + ... + 1775588.

Almost surely, 2^243246240 is an apocalyptic number.

243246240 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 243246240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (432384183).

243246240 is an abundant number, since it is smaller than the sum of its proper divisors (621522126).

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

243246240 is an equidigital number, since it uses as much as digits as its factorization.

243246240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 243246240 is about 15596.3534199504. The cubic root of 243246240 is about 624.2358575856.

Adding to 243246240 its reverse (42642342), we get a palindrome (285888582).

The spelling of 243246240 in words is "two hundred forty-three million, two hundred forty-six thousand, two hundred forty".