3981818 has 8 divisors (see below), whose sum is σ = 5988180. Its totient is φ = 1985760.

The previous prime is 3981767. The next prime is 3981821. The reversal of 3981818 is 8181893.

It can be written as a sum of positive squares in 2 ways, for example, as 2411809 + 1570009 = 1553^2 + 1253^2 .

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

3981818 is a modest number, since divided by 1818 gives 398 as remainder.

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, 1523 + ... + 3206.

Almost surely, 2^3981818 is an apocalyptic number.

3981818 is a deficient number, since it is larger than the sum of its proper divisors (2006362).

3981818 is a wasteful number, since it uses less digits than its factorization.

3981818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5152.

The product of its digits is 13824, while the sum is 38.

The square root of 3981818 is about 1995.4493228343. The cubic root of 3981818 is about 158.4992221333.

The spelling of 3981818 in words is "three million, nine hundred eighty-one thousand, eight hundred eighteen".