3991064 has 96 divisors (see below), whose sum is σ = 10214400. Its totient is φ = 1425600.

The previous prime is 3991051. The next prime is 3991087. The reversal of 3991064 is 4601993.

3991064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 3991064.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128729 + ... + 128759.

It is an arithmetic number, because the mean of its divisors is an integer number (106400).

Almost surely, 2^3991064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3991064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5107200).

3991064 is an abundant number, since it is smaller than the sum of its proper divisors (6223336).

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

3991064 is a wasteful number, since it uses less digits than its factorization.

3991064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 3991064 is about 1997.7647509154. The cubic root of 3991064 is about 158.6218085965.

The spelling of 3991064 in words is "three million, nine hundred ninety-one thousand, sixty-four".