8421618 has 8 divisors (see below), whose sum is σ = 16843248. Its totient is φ = 2807204.

The previous prime is 8421587. The next prime is 8421619. The reversal of 8421618 is 8161248.

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

8421618 is an admirable number.

It is a d-powerful number, because it can be written as 8 + 4² + 2²³ + 1 + 6³ + 1 + 8⁵ .

It is not an unprimeable number, because it can be changed into a prime (8421619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701796 + ... + 701807.

It is an arithmetic number, because the mean of its divisors is an integer number (2105406).

Almost surely, 2^8421618 is an apocalyptic number.

8421618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8421618 is a wasteful number, since it uses less digits than its factorization.

8421618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403608.

The product of its digits is 3072, while the sum is 30.

The square root of 8421618 is about 2902.0024121286. The cubic root of 8421618 is about 203.4535065544.

The spelling of 8421618 in words is "eight million, four hundred twenty-one thousand, six hundred eighteen".