286621 has 4 divisors (see below), whose sum is σ = 287712. Its totient is φ = 285532.

The previous prime is 286619. The next prime is 286633. The reversal of 286621 is 126682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 286621 - 2¹ = 286619 is a prime.

It is a Duffinian number.

286621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (286651) 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, 120 + ... + 766.

It is an arithmetic number, because the mean of its divisors is an integer number (71928).

2²⁸⁶⁶²¹ is an apocalyptic number.

It is an amenable number.

286621 is a deficient number, since it is larger than the sum of its proper divisors (1091).

286621 is an equidigital number, since it uses as much as digits as its factorization.

286621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090.

The product of its digits is 1152, while the sum is 25.

The square root of 286621 is about 535.3699655379. The cubic root of 286621 is about 65.9329745028.

The spelling of 286621 in words is "two hundred eighty-six thousand, six hundred twenty-one".