243253546440 has 256 divisors, whose sum is σ = 745765574400. Its totient is φ = 63465652224.

The previous prime is 243253546423. The next prime is 243253546447. The reversal of 243253546440 is 44645352342.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 243253546392 and 243253546401.

It is not an unprimeable number, because it can be changed into a prime (243253546447) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 652154094 + ... + 652154466.

It is an arithmetic number, because the mean of its divisors is an integer number (2913146775).

Almost surely, 2^243253546440 is an apocalyptic number.

243253546440 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 243253546440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (372882787200).

243253546440 is an abundant number, since it is smaller than the sum of its proper divisors (502512027960).

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

243253546440 is a wasteful number, since it uses less digits than its factorization.

243253546440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976 (or 972 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 42.

Adding to 243253546440 its reverse (44645352342), we get a palindrome (287898898782).

The spelling of 243253546440 in words is "two hundred forty-three billion, two hundred fifty-three million, five hundred forty-six thousand, four hundred forty".