8406218 has 4 divisors (see below), whose sum is σ = 12609330. Its totient is φ = 4203108.

The previous prime is 8406193. The next prime is 8406221. The reversal of 8406218 is 8126048.

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., 5726449 + 2679769 = 2393^2 + 1637^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2101553 + ... + 2101556.

Almost surely, 2^8406218 is an apocalyptic number.

8406218 is a deficient number, since it is larger than the sum of its proper divisors (4203112).

8406218 is a wasteful number, since it uses less digits than its factorization.

8406218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4203111.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 8406218 is about 2899.3478577087. The cubic root of 8406218 is about 203.3294173452.

The spelling of 8406218 in words is "eight million, four hundred six thousand, two hundred eighteen".