3991126 has 8 divisors (see below), whose sum is σ = 6179904. Its totient is φ = 1931160.

The previous prime is 3991111. The next prime is 3991139. The reversal of 3991126 is 6211993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 32125 + ... + 32248.

It is an arithmetic number, because the mean of its divisors is an integer number (772488).

Almost surely, 2^3991126 is an apocalyptic number.

3991126 is a deficient number, since it is larger than the sum of its proper divisors (2188778).

3991126 is a wasteful number, since it uses less digits than its factorization.

3991126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64406.

The product of its digits is 2916, while the sum is 31.

The square root of 3991126 is about 1997.7802681977. The cubic root of 3991126 is about 158.6226299732.

The spelling of 3991126 in words is "three million, nine hundred ninety-one thousand, one hundred twenty-six".