3971818 has 8 divisors (see below), whose sum is σ = 5968260. Its totient is φ = 1982400.

The previous prime is 3971809. The next prime is 3971833. The reversal of 3971818 is 8181793.

It can be written as a sum of positive squares in 2 ways, for example, as 3814209 + 157609 = 1953^2 + 397^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18 + ... + 2818.

Almost surely, 2^3971818 is an apocalyptic number.

3971818 is a deficient number, since it is larger than the sum of its proper divisors (1996442).

3971818 is a wasteful number, since it uses less digits than its factorization.

3971818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512.

The product of its digits is 12096, while the sum is 37.

The square root of 3971818 is about 1992.9420463225. The cubic root of 3971818 is about 158.3664250932.

The spelling of 3971818 in words is "three million, nine hundred seventy-one thousand, eight hundred eighteen".