84521818 has 8 divisors (see below), whose sum is σ = 126896148. Its totient is φ = 42223104.

The previous prime is 84521813. The next prime is 84521821. The reversal of 84521818 is 81812548.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 83594449 + 927369 = 9143^2 + 963^2 .

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

It is not an unprimeable number, because it can be changed into a prime (84521813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16021 + ... + 20632.

Almost surely, 2^84521818 is an apocalyptic number.

84521818 is a deficient number, since it is larger than the sum of its proper divisors (42374330).

84521818 is a wasteful number, since it uses less digits than its factorization.

84521818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37808.

The product of its digits is 20480, while the sum is 37.

The square root of 84521818 is about 9193.5748215806. The cubic root of 84521818 is about 438.8569123908.

The spelling of 84521818 in words is "eighty-four million, five hundred twenty-one thousand, eight hundred eighteen".