243353440 has 144 divisors (see below), whose sum is σ = 650979504. Its totient is φ = 85248000.

The previous prime is 243353401. The next prime is 243353443. The reversal of 243353440 is 44353342.

It is a junction number, because it is equal to n+sod(n) for n = 243353399 and 243353408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243353443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2409390 + ... + 2409490.

It is an arithmetic number, because the mean of its divisors is an integer number (4520691).

Almost surely, 2^243353440 is an apocalyptic number.

243353440 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 243353440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325489752).

243353440 is an abundant number, since it is smaller than the sum of its proper divisors (407626064).

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

243353440 is a wasteful number, since it uses less digits than its factorization.

243353440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 28.

The square root of 243353440 is about 15599.7897421728. The cubic root of 243353440 is about 624.3275455475.

The spelling of 243353440 in words is "two hundred forty-three million, three hundred fifty-three thousand, four hundred forty".