8220418 has 16 divisors (see below), whose sum is σ = 13376664. Its totient is φ = 3773440.

The previous prime is 8220409. The next prime is 8220419. The reversal of 8220418 is 8140228.

It can be written as a sum of positive squares in 4 ways, for example, as 7601049 + 619369 = 2757^2 + 787^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8220392 and 8220401.

It is not an unprimeable number, because it can be changed into a prime (8220419) 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 7 ways as a sum of consecutive naturals, for example, 1555 + ... + 4342.

Almost surely, 2^8220418 is an apocalyptic number.

8220418 is a deficient number, since it is larger than the sum of its proper divisors (5156246).

8220418 is a wasteful number, since it uses less digits than its factorization.

8220418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 8220418 is about 2867.1271335607. The cubic root of 8220418 is about 201.8202007580.

The spelling of 8220418 in words is "eight million, two hundred twenty thousand, four hundred eighteen".