243040842 has 72 divisors (see below), whose sum is σ = 583433760. Its totient is φ = 73062000.

The previous prime is 243040841. The next prime is 243040843. The reversal of 243040842 is 248040342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243040841) and next prime (243040843).

It is not an unprimeable number, because it can be changed into a prime (243040841) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 328509 + ... + 329247.

Almost surely, 2^243040842 is an apocalyptic number.

243040842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 243040842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291716880).

243040842 is an abundant number, since it is smaller than the sum of its proper divisors (340392918).

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

243040842 is a wasteful number, since it uses less digits than its factorization.

243040842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 243040842 is about 15589.7672208407. The cubic root of 243040842 is about 624.0601057733.

The spelling of 243040842 in words is "two hundred forty-three million, forty thousand, eight hundred forty-two".