478221 has 4 divisors (see below), whose sum is σ = 637632. Its totient is φ = 318812.

The previous prime is 478213. The next prime is 478241. The reversal of 478221 is 122874.

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.

It is a cyclic number.

It is not a de Polignac number, because 478221 - 2³ = 478213 is a prime.

It is a D-number.

478221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 478191 and 478200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478241) 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, 79701 + ... + 79706.

It is an arithmetic number, because the mean of its divisors is an integer number (159408).

2⁴⁷⁸²²¹ is an apocalyptic number.

It is an amenable number.

478221 is a deficient number, since it is larger than the sum of its proper divisors (159411).

478221 is a wasteful number, since it uses less digits than its factorization.

478221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159410.

The product of its digits is 896, while the sum is 24.

The square root of 478221 is about 691.5352485593. The cubic root of 478221 is about 78.2005032204.

The spelling of 478221 in words is "four hundred seventy-eight thousand, two hundred twenty-one".