204742 has 8 divisors (see below), whose sum is σ = 309456. Its totient is φ = 101592.

The previous prime is 204733. The next prime is 204749. The reversal of 204742 is 247402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204749) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 28 + ... + 640.

It is an arithmetic number, because the mean of its divisors is an integer number (38682).

2²⁰⁴⁷⁴² is an apocalyptic number.

204742 is a deficient number, since it is larger than the sum of its proper divisors (104714).

204742 is a wasteful number, since it uses less digits than its factorization.

204742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782.

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 204742 is about 452.4842538697. The cubic root of 204742 is about 58.9389390303.

It can be divided in two parts, 204 and 742, that added together give a triangular number (946 = T₄₃).

The spelling of 204742 in words is "two hundred four thousand, seven hundred forty-two", and thus it is an iban number.