243242340 has 192 divisors, whose sum is σ = 777288960. Its totient is φ = 56320000.

The previous prime is 243242327. The next prime is 243242359. The reversal of 243242340 is 43242342.

243242340 = T₂₁₄₄ + T₂₁₄₅ + ... + T₂₂₄₄.

It is a self number, because there is not a number n which added to its sum of digits gives 243242340.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 2408290 + ... + 2408390.

It is an arithmetic number, because the mean of its divisors is an integer number (4048380).

Almost surely, 2^243242340 is an apocalyptic number.

243242340 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 243242340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388644480).

243242340 is an abundant number, since it is smaller than the sum of its proper divisors (534046620).

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

243242340 is a wasteful number, since it uses less digits than its factorization.

243242340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 24.

The square root of 243242340 is about 15596.2283902231. The cubic root of 243242340 is about 624.2325214150.

Adding to 243242340 its reverse (43242342), we get a palindrome (286484682).

The spelling of 243242340 in words is "two hundred forty-three million, two hundred forty-two thousand, three hundred forty".