286989 has 8 divisors (see below), whose sum is σ = 385152. Its totient is φ = 190080.

The previous prime is 286987. The next prime is 286999. The reversal of 286989 is 989682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 286989 - 2¹ = 286987 is a prime.

It is a super-2 number, since 2×286989² = 164725372242, 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 286989.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 286989.

It is not an unprimeable number, because it can be changed into a prime (286981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637 + ... + 989.

It is an arithmetic number, because the mean of its divisors is an integer number (48144).

2²⁸⁶⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

286989 is a deficient number, since it is larger than the sum of its proper divisors (98163).

286989 is a wasteful number, since it uses less digits than its factorization.

286989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627.

The product of its digits is 62208, while the sum is 42.

The square root of 286989 is about 535.7135428566. The cubic root of 286989 is about 65.9611801099.

It can be divided in two parts, 286 and 989, that added together give a triangular number (1275 = T₅₀).

The spelling of 286989 in words is "two hundred eighty-six thousand, nine hundred eighty-nine".