6402218 has 4 divisors (see below), whose sum is σ = 9603330. Its totient is φ = 3201108.

The previous prime is 6402203. The next prime is 6402247. The reversal of 6402218 is 8122046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8122046 = 2 ⋅4061023.

It can be written as a sum of positive squares in only one way, i.e., 3636649 + 2765569 = 1907^2 + 1663^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6402193 and 6402202.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1600553 + ... + 1600556.

Almost surely, 2^6402218 is an apocalyptic number.

6402218 is a deficient number, since it is larger than the sum of its proper divisors (3201112).

6402218 is a wasteful number, since it uses less digits than its factorization.

6402218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201111.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 6402218 is about 2530.2604609012. The cubic root of 6402218 is about 185.6849988757.

The spelling of 6402218 in words is "six million, four hundred two thousand, two hundred eighteen".