3947218 has 16 divisors (see below), whose sum is σ = 6570720. Its totient is φ = 1763200.

The previous prime is 3947189. The next prime is 3947227. The reversal of 3947218 is 8127493.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223 + ... + 2818.

It is an arithmetic number, because the mean of its divisors is an integer number (410670).

Almost surely, 2^3947218 is an apocalyptic number.

3947218 is a deficient number, since it is larger than the sum of its proper divisors (2623502).

3947218 is a wasteful number, since it uses less digits than its factorization.

3947218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113.

The product of its digits is 12096, while the sum is 34.

The square root of 3947218 is about 1986.7606801022. The cubic root of 3947218 is about 158.0387930169.

The spelling of 3947218 in words is "three million, nine hundred forty-seven thousand, two hundred eighteen".