6422818 has 4 divisors (see below), whose sum is σ = 9634230. Its totient is φ = 3211408.

The previous prime is 6422813. The next prime is 6422837. The reversal of 6422818 is 8182246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4941729 + 1481089 = 2223^2 + 1217^2 .

It is a super-2 number, since 2×6422818² = 82505182122248, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6422818.

It is not an unprimeable number, because it can be changed into a prime (6422813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605703 + ... + 1605706.

Almost surely, 2^6422818 is an apocalyptic number.

6422818 is a deficient number, since it is larger than the sum of its proper divisors (3211412).

6422818 is a wasteful number, since it uses less digits than its factorization.

6422818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211411.

The product of its digits is 6144, while the sum is 31.

The square root of 6422818 is about 2534.3279187982. The cubic root of 6422818 is about 185.8839411637.

It can be divided in two parts, 64228 and 18, that added together give a palindrome (64246).

The spelling of 6422818 in words is "six million, four hundred twenty-two thousand, eight hundred eighteen".