204142 has 4 divisors (see below), whose sum is σ = 306216. Its totient is φ = 102070.

The previous prime is 204137. The next prime is 204143. The reversal of 204142 is 241402.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204143) by changing a digit.

204142 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51034 + ... + 51037.

It is an arithmetic number, because the mean of its divisors is an integer number (76554).

2²⁰⁴¹⁴² is an apocalyptic number.

204142 is a deficient number, since it is larger than the sum of its proper divisors (102074).

204142 is a wasteful number, since it uses less digits than its factorization.

204142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102073.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 204142 is about 451.8207609219. The cubic root of 204142 is about 58.8813088354.

Adding to 204142 its reverse (241402), we get a palindrome (445544).

The spelling of 204142 in words is "two hundred four thousand, one hundred forty-two", and thus it is an iban number.