3996691 has 4 divisors (see below), whose sum is σ = 4037992. Its totient is φ = 3955392.

The previous prime is 3996653. The next prime is 3996743. The reversal of 3996691 is 1966993.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3996691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3996791) 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, 20505 + ... + 20698.

It is an arithmetic number, because the mean of its divisors is an integer number (1009498).

Almost surely, 2^3996691 is an apocalyptic number.

3996691 is a deficient number, since it is larger than the sum of its proper divisors (41301).

3996691 is an equidigital number, since it uses as much as digits as its factorization.

3996691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41300.

The product of its digits is 78732, while the sum is 43.

The square root of 3996691 is about 1999.1725788436. The cubic root of 3996691 is about 158.6963205370.

The spelling of 3996691 in words is "three million, nine hundred ninety-six thousand, six hundred ninety-one".