8400218 has 4 divisors (see below), whose sum is σ = 12600330. Its totient is φ = 4200108.

The previous prime is 8400211. The next prime is 8400229. The reversal of 8400218 is 8120048.

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., 8048569 + 351649 = 2837^2 + 593^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8400193 and 8400202.

It is not an unprimeable number, because it can be changed into a prime (8400211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2100053 + ... + 2100056.

Almost surely, 2^8400218 is an apocalyptic number.

8400218 is a deficient number, since it is larger than the sum of its proper divisors (4200112).

8400218 is a wasteful number, since it uses less digits than its factorization.

8400218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200111.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 8400218 is about 2898.3129575669. The cubic root of 8400218 is about 203.2810298748.

The spelling of 8400218 in words is "eight million, four hundred thousand, two hundred eighteen".