243201405042 has 80 divisors (see below), whose sum is σ = 559624032000. Its totient is φ = 78913336320.

The previous prime is 243201405037. The next prime is 243201405043. The reversal of 243201405042 is 240504102342.

243201405042 is a `hidden beast` number, since 2 + 432 + 0 + 140 + 50 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 243201404997 and 243201405015.

It is not an unprimeable number, because it can be changed into a prime (243201405043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 774834 + ... + 1042482.

It is an arithmetic number, because the mean of its divisors is an integer number (6995300400).

Almost surely, 2^243201405042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243201405042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279812016000).

243201405042 is an abundant number, since it is smaller than the sum of its proper divisors (316422626958).

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

243201405042 is a wasteful number, since it uses less digits than its factorization.

243201405042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267813 (or 267804 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 243201405042 its reverse (240504102342), we get a palindrome (483705507384).

The spelling of 243201405042 in words is "two hundred forty-three billion, two hundred one million, four hundred five thousand, forty-two".