3947818 has 16 divisors (see below), whose sum is σ = 6793920. Its totient is φ = 1685376.

The previous prime is 3947809. The next prime is 3947831. The reversal of 3947818 is 8187493.

3947818 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×3947818² = 31170533922248, which contains 22 as substring.

3947818 is strictly pandigital in base 8.

It is a congruent number.

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, 5530 + ... + 6202.

It is an arithmetic number, because the mean of its divisors is an integer number (424620).

Almost surely, 2^3947818 is an apocalyptic number.

3947818 is a deficient number, since it is larger than the sum of its proper divisors (2846102).

3947818 is a wasteful number, since it uses less digits than its factorization.

3947818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101.

The product of its digits is 48384, while the sum is 40.

The square root of 3947818 is about 1986.9116739302. The cubic root of 3947818 is about 158.0468002152.

The spelling of 3947818 in words is "three million, nine hundred forty-seven thousand, eight hundred eighteen".