3991146 has 16 divisors (see below), whose sum is σ = 8152704. Its totient is φ = 1301984.

The previous prime is 3991139. The next prime is 3991181. The reversal of 3991146 is 6411993.

It is a nialpdrome in base 13.

It is an unprimeable number.

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, 6795 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (509544).

Almost surely, 2^3991146 is an apocalyptic number.

3991146 is an abundant number, since it is smaller than the sum of its proper divisors (4161558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3991146 is a wasteful number, since it uses less digits than its factorization.

3991146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14205.

The product of its digits is 5832, while the sum is 33.

The square root of 3991146 is about 1997.7852737469. The cubic root of 3991146 is about 158.6228949316.

The spelling of 3991146 in words is "three million, nine hundred ninety-one thousand, one hundred forty-six".