284621 has 4 divisors (see below), whose sum is σ = 286044. Its totient is φ = 283200.

The previous prime is 284593. The next prime is 284623. The reversal of 284621 is 126482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126482 = 2 ⋅63241.

It can be written as a sum of positive squares in 2 ways, for example, as 240100 + 44521 = 490^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 284621 - 2¹⁴ = 268237 is a prime.

It is a super-2 number, since 2×284621² = 162018227282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

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 284621.

It is not an unprimeable number, because it can be changed into a prime (284623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350 + ... + 831.

It is an arithmetic number, because the mean of its divisors is an integer number (71511).

2²⁸⁴⁶²¹ is an apocalyptic number.

It is an amenable number.

284621 is a deficient number, since it is larger than the sum of its proper divisors (1423).

284621 is a wasteful number, since it uses less digits than its factorization.

284621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422.

The product of its digits is 768, while the sum is 23.

The square root of 284621 is about 533.4988284898. The cubic root of 284621 is about 65.7792594837.

The spelling of 284621 in words is "two hundred eighty-four thousand, six hundred twenty-one".