285988 has 24 divisors (see below), whose sum is σ = 544320. Its totient is φ = 131040.

The previous prime is 285983. The next prime is 285997. The reversal of 285988 is 889582.

It is a happy number.

It is a super-2 number, since 2×285988² = 163578272288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 285988.

It is not an unprimeable number, because it can be changed into a prime (285983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3993 + ... + 4063.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2²⁸⁵⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

285988 is a deficient number, since it is larger than the sum of its proper divisors (258332).

285988 is a wasteful number, since it uses less digits than its factorization.

285988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 145 counting only the distinct ones).

The product of its digits is 46080, while the sum is 40.

The square root of 285988 is about 534.7784588033. The cubic root of 285988 is about 65.8844012593.

The spelling of 285988 in words is "two hundred eighty-five thousand, nine hundred eighty-eight".