286021 has 4 divisors (see below), whose sum is σ = 287500. Its totient is φ = 284544.

The previous prime is 286019. The next prime is 286043. The reversal of 286021 is 120682.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 202500 + 83521 = 450^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 286021 - 2¹ = 286019 is a prime.

It is a Duffinian number.

286021 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 286021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (286001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396 + ... + 853.

It is an arithmetic number, because the mean of its divisors is an integer number (71875).

2²⁸⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

286021 is a deficient number, since it is larger than the sum of its proper divisors (1479).

286021 is a wasteful number, since it uses less digits than its factorization.

286021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 286021 is about 534.8093118112. The cubic root of 286021 is about 65.8869352836.

The spelling of 286021 in words is "two hundred eighty-six thousand, twenty-one".