3966987 has 4 divisors (see below), whose sum is σ = 5289320. Its totient is φ = 2644656.

The previous prime is 3966961. The next prime is 3967027. The reversal of 3966987 is 7896693.

It is a happy number.

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

It is not a de Polignac number, because 3966987 - 2⁶ = 3966923 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3966887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661162 + ... + 661167.

It is an arithmetic number, because the mean of its divisors is an integer number (1322330).

Almost surely, 2^3966987 is an apocalyptic number.

3966987 is a deficient number, since it is larger than the sum of its proper divisors (1322333).

3966987 is a wasteful number, since it uses less digits than its factorization.

3966987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322332.

The product of its digits is 489888, while the sum is 48.

The square root of 3966987 is about 1991.7296503291. The cubic root of 3966987 is about 158.3021909819.

The spelling of 3966987 in words is "three million, nine hundred sixty-six thousand, nine hundred eighty-seven".