455821 has 4 divisors (see below), whose sum is σ = 482652. Its totient is φ = 428992.

The previous prime is 455809. The next prime is 455827. The reversal of 455821 is 128554.

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 346921 + 108900 = 589^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 455821 - 2⁵ = 455789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (455827) 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, 13390 + ... + 13423.

It is an arithmetic number, because the mean of its divisors is an integer number (120663).

2⁴⁵⁵⁸²¹ is an apocalyptic number.

It is an amenable number.

455821 is a deficient number, since it is larger than the sum of its proper divisors (26831).

455821 is a wasteful number, since it uses less digits than its factorization.

455821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26830.

The product of its digits is 1600, while the sum is 25.

The square root of 455821 is about 675.1451695747. The cubic root of 455821 is about 76.9599499375.

The spelling of 455821 in words is "four hundred fifty-five thousand, eight hundred twenty-one".