478665 has 24 divisors (see below), whose sum is σ = 906048. Its totient is φ = 231840.

The previous prime is 478651. The next prime is 478679. The reversal of 478665 is 566874.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (478651) and next prime (478679).

It is not a de Polignac number, because 478665 - 2¹² = 474569 is a prime.

It is a Curzon number.

478665 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 478665.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 12 + ... + 978.

It is an arithmetic number, because the mean of its divisors is an integer number (37752).

2⁴⁷⁸⁶⁶⁵ is an apocalyptic number.

478665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

478665 is a deficient number, since it is larger than the sum of its proper divisors (427383).

478665 is a wasteful number, since it uses less digits than its factorization.

478665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989 (or 986 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 478665 is about 691.8561989315. The cubic root of 478665 is about 78.2246972531.

Subtracting 478665 from its reverse (566874), we obtain a square (88209 = 297²).

It can be divided in two parts, 4786 and 65, that added together give a triangular number (4851 = T₉₈).

The spelling of 478665 in words is "four hundred seventy-eight thousand, six hundred sixty-five".