285742 has 4 divisors (see below), whose sum is σ = 428616. Its totient is φ = 142870.

The previous prime is 285731. The next prime is 285749. The reversal of 285742 is 247582.

285742 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247582 = 2 ⋅123791.

It is a d-powerful number, because it can be written as 2⁵ + 8⁵ + 7⁶ + 5³ + 4⁶ + 2¹⁷ .

It is a self number, because there is not a number n which added to its sum of digits gives 285742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285749) by changing a digit.

285742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71434 + ... + 71437.

It is an arithmetic number, because the mean of its divisors is an integer number (107154).

2²⁸⁵⁷⁴² is an apocalyptic number.

285742 is a deficient number, since it is larger than the sum of its proper divisors (142874).

285742 is a wasteful number, since it uses less digits than its factorization.

285742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142873.

The product of its digits is 4480, while the sum is 28.

The square root of 285742 is about 534.5484075367. The cubic root of 285742 is about 65.8655051145.

The spelling of 285742 in words is "two hundred eighty-five thousand, seven hundred forty-two".