3957986 has 4 divisors (see below), whose sum is σ = 5936982. Its totient is φ = 1978992.

The previous prime is 3957983. The next prime is 3958013. The reversal of 3957986 is 6897593.

3957986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3441025 + 516961 = 1855^2 + 719^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3957986.

It is not an unprimeable number, because it can be changed into a prime (3957983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989495 + ... + 989498.

Almost surely, 2^3957986 is an apocalyptic number.

3957986 is a deficient number, since it is larger than the sum of its proper divisors (1978996).

3957986 is a wasteful number, since it uses less digits than its factorization.

3957986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978995.

The product of its digits is 408240, while the sum is 47.

The square root of 3957986 is about 1989.4687733161. The cubic root of 3957986 is about 158.1823723342.

The spelling of 3957986 in words is "three million, nine hundred fifty-seven thousand, nine hundred eighty-six".