204140042 has 12 divisors (see below), whose sum is σ = 320104050. Its totient is φ = 97631688.

The previous prime is 204140023. The next prime is 204140081. The reversal of 204140042 is 240041402.

It can be written as a sum of positive squares in only one way, i.e., 161772961 + 42367081 = 12719^2 + 6509^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 204140042.

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 5 ways as a sum of consecutive naturals, for example, 95417 + ... + 97532.

Almost surely, 2^204140042 is an apocalyptic number.

204140042 is a deficient number, since it is larger than the sum of its proper divisors (115964008).

204140042 is a wasteful number, since it uses less digits than its factorization.

204140042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192997 (or 192974 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 204140042 is about 14287.7584666035. The cubic root of 204140042 is about 588.8112058414.

Adding to 204140042 its reverse (240041402), we get a palindrome (444181444).

The spelling of 204140042 in words is "two hundred four million, one hundred forty thousand, forty-two".