285142 has 16 divisors (see below), whose sum is σ = 502992. Its totient is φ = 119520.

The previous prime is 285139. The next prime is 285151. The reversal of 285142 is 241582.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213 + ... + 784.

It is an arithmetic number, because the mean of its divisors is an integer number (31437).

2²⁸⁵¹⁴² is an apocalyptic number.

285142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

285142 is a deficient number, since it is larger than the sum of its proper divisors (217850).

285142 is a wasteful number, since it uses less digits than its factorization.

285142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023.

The product of its digits is 640, while the sum is 22.

The square root of 285142 is about 533.9868912249. The cubic root of 285142 is about 65.8193714272.

It can be divided in two parts, 285 and 142, that multiplied together give a triangular number (40470 = T₂₈₄).

The spelling of 285142 in words is "two hundred eighty-five thousand, one hundred forty-two".