243201023440 has 40 divisors (see below), whose sum is σ = 566785551528. Its totient is φ = 97049326080.

The previous prime is 243201023431. The next prime is 243201023449. The reversal of 243201023440 is 44320102342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243201023431) and next prime (243201023449).

It can be written as a sum of positive squares in 4 ways, for example, as 11501275536 + 231699747904 = 107244^2 + 481352^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243201023449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3576787 + ... + 3644146.

Almost surely, 2^243201023440 is an apocalyptic number.

243201023440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243201023440 is an abundant number, since it is smaller than the sum of its proper divisors (323584528088).

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

243201023440 is a wasteful number, since it uses less digits than its factorization.

243201023440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7221367 (or 7221361 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 243201023440 its reverse (44320102342), we get a palindrome (287521125782).

The spelling of 243201023440 in words is "two hundred forty-three billion, two hundred one million, twenty-three thousand, four hundred forty".