3966989 has 8 divisors (see below), whose sum is σ = 4296600. Its totient is φ = 3640896.

The previous prime is 3966961. The next prime is 3967027. The reversal of 3966989 is 9896693.

It can be written as a sum of positive squares in 4 ways, for example, as 708964 + 3258025 = 842^2 + 1805^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3966989 - 2¹⁶ = 3901453 is a prime.

It is a super-2 number, since 2×3966989² = 31474003452242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1787 + ... + 3335.

It is an arithmetic number, because the mean of its divisors is an integer number (537075).

Almost surely, 2^3966989 is an apocalyptic number.

It is an amenable number.

3966989 is a deficient number, since it is larger than the sum of its proper divisors (329611).

3966989 is a wasteful number, since it uses less digits than its factorization.

3966989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759.

The product of its digits is 629856, while the sum is 50.

The square root of 3966989 is about 1991.7301524052. The cubic root of 3966989 is about 158.3022175851.

The spelling of 3966989 in words is "three million, nine hundred sixty-six thousand, nine hundred eighty-nine".