285642 has 24 divisors (see below), whose sum is σ = 707616. Its totient is φ = 81576.

The previous prime is 285641. The next prime is 285643. The reversal of 285642 is 246582.

It is an interprime number because it is at equal distance from previous prime (285641) and next prime (285643).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (285641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1008 + ... + 1259.

It is an arithmetic number, because the mean of its divisors is an integer number (29484).

2²⁸⁵⁶⁴² is an apocalyptic number.

285642 is an abundant number, since it is smaller than the sum of its proper divisors (421974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

285642 is a wasteful number, since it uses less digits than its factorization.

285642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282 (or 2279 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 285642 is about 534.4548624533. The cubic root of 285642 is about 65.8578206543.

Subtracting from 285642 its reverse (246582), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 285642 in words is "two hundred eighty-five thousand, six hundred forty-two".