8478991 has 8 divisors (see below), whose sum is σ = 8884800. Its totient is φ = 8080800.

The previous prime is 8478989. The next prime is 8479007. The reversal of 8478991 is 1998748.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8478991 - 2¹ = 8478989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8478961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441 + ... + 4141.

It is an arithmetic number, because the mean of its divisors is an integer number (1110600).

Almost surely, 2^8478991 is an apocalyptic number.

8478991 is a deficient number, since it is larger than the sum of its proper divisors (405809).

8478991 is a wasteful number, since it uses less digits than its factorization.

8478991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3809.

The product of its digits is 145152, while the sum is 46.

The square root of 8478991 is about 2911.8707045472. The cubic root of 8478991 is about 203.9144761971.

The spelling of 8478991 in words is "eight million, four hundred seventy-eight thousand, nine hundred ninety-one".