3966986 has 4 divisors (see below), whose sum is σ = 5950482. Its totient is φ = 1983492.

The previous prime is 3966961. The next prime is 3967027. The reversal of 3966986 is 6896693.

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., 2157961 + 1809025 = 1469^2 + 1345^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3966986.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991745 + ... + 991748.

Almost surely, 2^3966986 is an apocalyptic number.

3966986 is a deficient number, since it is larger than the sum of its proper divisors (1983496).

3966986 is a wasteful number, since it uses less digits than its factorization.

3966986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983495.

The product of its digits is 419904, while the sum is 47.

The square root of 3966986 is about 1991.7293992910. The cubic root of 3966986 is about 158.3021776802.

The spelling of 3966986 in words is "three million, nine hundred sixty-six thousand, nine hundred eighty-six".