243132435440 has 80 divisors (see below), whose sum is σ = 573959157120. Its totient is φ = 95761501440.

The previous prime is 243132435437. The next prime is 243132435443. The reversal of 243132435440 is 44534231342.

It is an interprime number because it is at equal distance from previous prime (243132435437) and next prime (243132435443).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×243132435440² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243132435440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243132435443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15101795 + ... + 15117885.

It is an arithmetic number, because the mean of its divisors is an integer number (7174489464).

Almost surely, 2^243132435440 is an apocalyptic number.

243132435440 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 243132435440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286979578560).

243132435440 is an abundant number, since it is smaller than the sum of its proper divisors (330826721680).

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

243132435440 is a wasteful number, since it uses less digits than its factorization.

243132435440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18990 (or 18984 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 35.

Adding to 243132435440 its reverse (44534231342), we get a palindrome (287666666782).

The spelling of 243132435440 in words is "two hundred forty-three billion, one hundred thirty-two million, four hundred thirty-five thousand, four hundred forty".