3990986 has 8 divisors (see below), whose sum is σ = 6084804. Its totient is φ = 1962720.

The previous prime is 3990979. The next prime is 3990997. The reversal of 3990986 is 6890993.

It can be written as a sum of positive squares in 2 ways, for example, as 3667225 + 323761 = 1915^2 + 569^2 .

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

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, 16235 + ... + 16478.

Almost surely, 2^3990986 is an apocalyptic number.

3990986 is a deficient number, since it is larger than the sum of its proper divisors (2093818).

3990986 is a wasteful number, since it uses less digits than its factorization.

3990986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32776.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 3990986 is about 1997.7452290019. The cubic root of 3990986 is about 158.6207752395.

The spelling of 3990986 in words is "three million, nine hundred ninety thousand, nine hundred eighty-six".