478987 has 4 divisors (see below), whose sum is σ = 480816. Its totient is φ = 477160.

The previous prime is 478967. The next prime is 478991. The reversal of 478987 is 789874.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478987 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478927) 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 3 ways as a sum of consecutive naturals, for example, 439 + ... + 1072.

It is an arithmetic number, because the mean of its divisors is an integer number (120204).

2⁴⁷⁸⁹⁸⁷ is an apocalyptic number.

478987 is a deficient number, since it is larger than the sum of its proper divisors (1829).

478987 is a wasteful number, since it uses less digits than its factorization.

478987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828.

The product of its digits is 112896, while the sum is 43.

The square root of 478987 is about 692.0888671262. The cubic root of 478987 is about 78.2422340178.

The spelling of 478987 in words is "four hundred seventy-eight thousand, nine hundred eighty-seven".