204400042 has 32 divisors (see below), whose sum is σ = 384418944. Its totient is φ = 79185600.

The previous prime is 204400037. The next prime is 204400109. The reversal of 204400042 is 240004402.

It is a junction number, because it is equal to n+sod(n) for n = 204399989 and 204400025.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24208 + ... + 31540.

It is an arithmetic number, because the mean of its divisors is an integer number (12013092).

Almost surely, 2^204400042 is an apocalyptic number.

204400042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

204400042 is a deficient number, since it is larger than the sum of its proper divisors (180018902).

204400042 is a wasteful number, since it uses less digits than its factorization.

204400042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7534.

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 204400042 is about 14296.8542693839. The cubic root of 204400042 is about 589.0610767372.

Adding to 204400042 its reverse (240004402), we get a palindrome (444404444).

The spelling of 204400042 in words is "two hundred four million, four hundred thousand, forty-two".