243201440 has 24 divisors (see below), whose sum is σ = 574563780. Its totient is φ = 97280512.

The previous prime is 243201433. The next prime is 243201451. The reversal of 243201440 is 44102342.

It can be written as a sum of positive squares in 2 ways, for example, as 220581904 + 22619536 = 14852^2 + 4756^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 759845 + ... + 760164.

Almost surely, 2^243201440 is an apocalyptic number.

243201440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243201440 is an abundant number, since it is smaller than the sum of its proper divisors (331362340).

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

243201440 is a wasteful number, since it uses less digits than its factorization.

243201440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520024 (or 1520016 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 243201440 is about 15594.9171206518. The cubic root of 243201440 is about 624.1975322471.

Adding to 243201440 its reverse (44102342), we get a palindrome (287303782).

The spelling of 243201440 in words is "two hundred forty-three million, two hundred one thousand, four hundred forty".