3951643 has 4 divisors (see below), whose sum is σ = 4018680. Its totient is φ = 3884608.

The previous prime is 3951611. The next prime is 3951707. The reversal of 3951643 is 3461593.

3951643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3951643 - 2⁵ = 3951611 is a prime.

It is a Duffinian number.

3951643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3951443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33430 + ... + 33547.

It is an arithmetic number, because the mean of its divisors is an integer number (1004670).

Almost surely, 2^3951643 is an apocalyptic number.

3951643 is a deficient number, since it is larger than the sum of its proper divisors (67037).

3951643 is an equidigital number, since it uses as much as digits as its factorization.

3951643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67036.

The product of its digits is 9720, while the sum is 31.

The square root of 3951643 is about 1987.8739899702. The cubic root of 3951643 is about 158.0978270419.

The spelling of 3951643 in words is "three million, nine hundred fifty-one thousand, six hundred forty-three".