478821 has 12 divisors (see below), whose sum is σ = 734496. Its totient is φ = 271800.

The previous prime is 478813. The next prime is 478823. The reversal of 478821 is 128874.

It is not a de Polignac number, because 478821 - 2³ = 478813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478823) 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 11 ways as a sum of consecutive naturals, for example, 3096 + ... + 3246.

It is an arithmetic number, because the mean of its divisors is an integer number (61208).

2⁴⁷⁸⁸²¹ is an apocalyptic number.

It is an amenable number.

478821 is a deficient number, since it is larger than the sum of its proper divisors (255675).

478821 is an equidigital number, since it uses as much as digits as its factorization.

478821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 161 counting only the distinct ones).

The product of its digits is 3584, while the sum is 30.

The square root of 478821 is about 691.9689299383. The cubic root of 478821 is about 78.2331943073.

The spelling of 478821 in words is "four hundred seventy-eight thousand, eight hundred twenty-one".