478721 has 4 divisors (see below), whose sum is σ = 480192. Its totient is φ = 477252.

The previous prime is 478711. The next prime is 478727. The reversal of 478721 is 127874.

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 478721 - 2¹⁴ = 462337 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (478727) 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, 5 + ... + 978.

It is an arithmetic number, because the mean of its divisors is an integer number (120048).

2⁴⁷⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

478721 is a deficient number, since it is larger than the sum of its proper divisors (1471).

478721 is an equidigital number, since it uses as much as digits as its factorization.

478721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470.

The product of its digits is 3136, while the sum is 29.

The square root of 478721 is about 691.8966685857. The cubic root of 478721 is about 78.2277476900.

The spelling of 478721 in words is "four hundred seventy-eight thousand, seven hundred twenty-one".