243102440 has 64 divisors (see below), whose sum is σ = 629424000. Its totient is φ = 82775808.

The previous prime is 243102421. The next prime is 243102443. The reversal of 243102440 is 44201342.

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

It is not an unprimeable number, because it can be changed into a prime (243102443) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 38807 + ... + 44633.

It is an arithmetic number, because the mean of its divisors is an integer number (9834750).

Almost surely, 2^243102440 is an apocalyptic number.

243102440 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 243102440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314712000).

243102440 is an abundant number, since it is smaller than the sum of its proper divisors (386321560).

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

243102440 is a wasteful number, since it uses less digits than its factorization.

243102440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5994 (or 5990 counting only the distinct ones).

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

The square root of 243102440 is about 15591.7426864350. The cubic root of 243102440 is about 624.1128233975.

Adding to 243102440 its reverse (44201342), we get a palindrome (287303782).

The spelling of 243102440 in words is "two hundred forty-three million, one hundred two thousand, four hundred forty".