243943140 has 96 divisors (see below), whose sum is σ = 788336640. Its totient is φ = 55207296.

The previous prime is 243943127. The next prime is 243943177. The reversal of 243943140 is 41349342.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 243943098 and 243943107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40441 + ... + 46079.

It is an arithmetic number, because the mean of its divisors is an integer number (8211840).

Almost surely, 2^243943140 is an apocalyptic number.

243943140 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 243943140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394168320).

243943140 is an abundant number, since it is smaller than the sum of its proper divisors (544393500).

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

243943140 is a wasteful number, since it uses less digits than its factorization.

243943140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5761 (or 5759 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 243943140 is about 15618.6792015202. The cubic root of 243943140 is about 624.8314340076.

The spelling of 243943140 in words is "two hundred forty-three million, nine hundred forty-three thousand, one hundred forty".