3986943 has 4 divisors (see below), whose sum is σ = 5315928. Its totient is φ = 2657960.

The previous prime is 3986929. The next prime is 3986951. The reversal of 3986943 is 3496893.

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

It is a cyclic number.

It is not a de Polignac number, because 3986943 - 2⁹ = 3986431 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 3986895 and 3986904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3986923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664488 + ... + 664493.

It is an arithmetic number, because the mean of its divisors is an integer number (1328982).

Almost surely, 2^3986943 is an apocalyptic number.

3986943 is a deficient number, since it is larger than the sum of its proper divisors (1328985).

3986943 is a wasteful number, since it uses less digits than its factorization.

3986943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328984.

The product of its digits is 139968, while the sum is 42.

The square root of 3986943 is about 1996.7330818114. The cubic root of 3986943 is about 158.5671944560.

The spelling of 3986943 in words is "three million, nine hundred eighty-six thousand, nine hundred forty-three".