3991670 has 16 divisors (see below), whose sum is σ = 7207920. Its totient is φ = 1591584.

The previous prime is 3991667. The next prime is 3991679. The reversal of 3991670 is 761993.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3991670.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991679) 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, 5276 + ... + 5984.

It is an arithmetic number, because the mean of its divisors is an integer number (450495).

Almost surely, 2^3991670 is an apocalyptic number.

3991670 is a deficient number, since it is larger than the sum of its proper divisors (3216250).

3991670 is a wasteful number, since it uses less digits than its factorization.

3991670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 3991670 is about 1997.9164146680. The cubic root of 3991670 is about 158.6298365268.

The spelling of 3991670 in words is "three million, nine hundred ninety-one thousand, six hundred seventy".