8421951918 has 16 divisors (see below), whose sum is σ = 16887209040. Its totient is φ = 2800099776.

The previous prime is 8421951907. The next prime is 8421951931. The reversal of 8421951918 is 8191591248.

It is a happy number.

8421951918 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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, 1801855 + ... + 1806522.

It is an arithmetic number, because the mean of its divisors is an integer number (1055450565).

Almost surely, 2^8421951918 is an apocalyptic number.

8421951918 is an abundant number, since it is smaller than the sum of its proper divisors (8465257122).

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

8421951918 is a wasteful number, since it uses less digits than its factorization.

8421951918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608771.

The product of its digits is 207360, while the sum is 48.

The square root of 8421951918 is about 91771.1932907053. The cubic root of 8421951918 is about 2034.5619550283.

The spelling of 8421951918 in words is "eight billion, four hundred twenty-one million, nine hundred fifty-one thousand, nine hundred eighteen".