3968691 has 4 divisors (see below), whose sum is σ = 5291592. Its totient is φ = 2645792.

The previous prime is 3968669. The next prime is 3968717. The reversal of 3968691 is 1968693.

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 3968691 - 2¹³ = 3960499 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3968291) by changing a digit.

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, 661446 + ... + 661451.

It is an arithmetic number, because the mean of its divisors is an integer number (1322898).

Almost surely, 2^3968691 is an apocalyptic number.

3968691 is a deficient number, since it is larger than the sum of its proper divisors (1322901).

3968691 is a wasteful number, since it uses less digits than its factorization.

3968691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322900.

The product of its digits is 69984, while the sum is 42.

The square root of 3968691 is about 1992.1573733016. The cubic root of 3968691 is about 158.3248537164.

The spelling of 3968691 in words is "three million, nine hundred sixty-eight thousand, six hundred ninety-one".