285425 has 18 divisors (see below), whose sum is σ = 413478. Its totient is φ = 194880.

The previous prime is 285421. The next prime is 285433. The reversal of 285425 is 524582.

285425 = 51² + 52² + ... + 99².

It can be written as a sum of positive squares in 3 ways, for example, as 2401 + 283024 = 49^2 + 532^2 .

It is not a de Polignac number, because 285425 - 2² = 285421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 285394 and 285403.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285425.

It is not an unprimeable number, because it can be changed into a prime (285421) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1109 + ... + 1341.

It is an arithmetic number, because the mean of its divisors is an integer number (22971).

2²⁸⁵⁴²⁵ is an apocalyptic number.

285425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

285425 is a deficient number, since it is larger than the sum of its proper divisors (128053).

285425 is a wasteful number, since it uses less digits than its factorization.

285425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 245 counting only the distinct ones).

The product of its digits is 3200, while the sum is 26.

The square root of 285425 is about 534.2518132866. The cubic root of 285425 is about 65.8411392051.

The spelling of 285425 in words is "two hundred eighty-five thousand, four hundred twenty-five".