478891 has 12 divisors (see below), whose sum is σ = 575472. Its totient is φ = 390096.

The previous prime is 478879. The next prime is 478897. The reversal of 478891 is 198874.

It is not a de Polignac number, because 478891 - 2⁷ = 478763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 478891.

It is not an unprimeable number, because it can be changed into a prime (478897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11116 + ... + 11158.

It is an arithmetic number, because the mean of its divisors is an integer number (47956).

2⁴⁷⁸⁸⁹¹ is an apocalyptic number.

478891 is a deficient number, since it is larger than the sum of its proper divisors (96581).

478891 is an equidigital number, since it uses as much as digits as its factorization.

478891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 87 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 478891 is about 692.0195083955. The cubic root of 478891 is about 78.2370064881.

It can be divided in two parts, 478 and 891, that added together give a square (1369 = 37²).

The spelling of 478891 in words is "four hundred seventy-eight thousand, eight hundred ninety-one".