3947691 has 8 divisors (see below), whose sum is σ = 5742144. Its totient is φ = 2392520.

The previous prime is 3947663. The next prime is 3947693. The reversal of 3947691 is 1967493.

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 3947691 - 2⁵ = 3947659 is a prime.

3947691 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3947693) 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, 59781 + ... + 59846.

It is an arithmetic number, because the mean of its divisors is an integer number (717768).

Almost surely, 2^3947691 is an apocalyptic number.

3947691 is a deficient number, since it is larger than the sum of its proper divisors (1794453).

3947691 is a wasteful number, since it uses less digits than its factorization.

3947691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119641.

The product of its digits is 40824, while the sum is 39.

The square root of 3947691 is about 1986.8797145273. The cubic root of 3947691 is about 158.0451054259.

The spelling of 3947691 in words is "three million, nine hundred forty-seven thousand, six hundred ninety-one".