6857218 has 4 divisors (see below), whose sum is σ = 10285830. Its totient is φ = 3428608.

The previous prime is 6857203. The next prime is 6857219. The reversal of 6857218 is 8127586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8127586 = 2 ⋅4063793.

It can be written as a sum of positive squares in only one way, i.e., 4507129 + 2350089 = 2123^2 + 1533^2 .

It is not an unprimeable number, because it can be changed into a prime (6857219) by changing a digit.

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, 1714303 + ... + 1714306.

Almost surely, 2^6857218 is an apocalyptic number.

6857218 is a deficient number, since it is larger than the sum of its proper divisors (3428612).

6857218 is a wasteful number, since it uses less digits than its factorization.

6857218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3428611.

The product of its digits is 26880, while the sum is 37.

The square root of 6857218 is about 2618.6290306189. The cubic root of 6857218 is about 189.9835442812.

The spelling of 6857218 in words is "six million, eight hundred fifty-seven thousand, two hundred eighteen".