3945691 has 8 divisors (see below), whose sum is σ = 4062960. Its totient is φ = 3830112.

The previous prime is 3945677. The next prime is 3945701. The reversal of 3945691 is 1965493.

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 3945691 - 2⁵ = 3945659 is a prime.

It is a Duffinian number.

3945691 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3945691.

It is not an unprimeable number, because it can be changed into a prime (3945631) 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 7 ways as a sum of consecutive naturals, for example, 5436 + ... + 6118.

It is an arithmetic number, because the mean of its divisors is an integer number (507870).

Almost surely, 2^3945691 is an apocalyptic number.

3945691 is a deficient number, since it is larger than the sum of its proper divisors (117269).

3945691 is a wasteful number, since it uses less digits than its factorization.

3945691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845.

The product of its digits is 29160, while the sum is 37.

The square root of 3945691 is about 1986.3763490336. The cubic root of 3945691 is about 158.0184110362.

The spelling of 3945691 in words is "three million, nine hundred forty-five thousand, six hundred ninety-one".