3991344 has 60 divisors (see below), whose sum is σ = 12001464. Its totient is φ = 1139712.

The previous prime is 3991333. The next prime is 3991369. The reversal of 3991344 is 4431993.

3991344 = T₂₃₅ + T₂₃₆ + ... + T₃₃₂.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1504 + ... + 3200.

Almost surely, 2^3991344 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 3991344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6000732).

3991344 is an abundant number, since it is smaller than the sum of its proper divisors (8010120).

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

3991344 is a wasteful number, since it uses less digits than its factorization.

3991344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722 (or 1709 counting only the distinct ones).

The product of its digits is 11664, while the sum is 33.

The square root of 3991344 is about 1997.8348280076. The cubic root of 3991344 is about 158.6255179722.

The spelling of 3991344 in words is "three million, nine hundred ninety-one thousand, three hundred forty-four".