8421518 has 16 divisors (see below), whose sum is σ = 14475264. Its totient is φ = 3599640.

The previous prime is 8421509. The next prime is 8421529. The reversal of 8421518 is 8151248.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8003 + ... + 8993.

It is an arithmetic number, because the mean of its divisors is an integer number (904704).

Almost surely, 2^8421518 is an apocalyptic number.

8421518 is a deficient number, since it is larger than the sum of its proper divisors (6053746).

8421518 is a wasteful number, since it uses less digits than its factorization.

8421518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607.

The product of its digits is 2560, while the sum is 29.

The square root of 8421518 is about 2901.9851825948. The cubic root of 8421518 is about 203.4527012685.

The spelling of 8421518 in words is "eight million, four hundred twenty-one thousand, five hundred eighteen".