3991752 has 24 divisors (see below), whose sum is σ = 10811190. Its totient is φ = 1330560.

The previous prime is 3991751. The next prime is 3991807. The reversal of 3991752 is 2571993.

3991752 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3481956 + 509796 = 1866^2 + 714^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (3991751) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 27649 + ... + 27792.

Almost surely, 2^3991752 is an apocalyptic number.

It is an amenable number.

3991752 is an abundant number, since it is smaller than the sum of its proper divisors (6819438).

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

3991752 is a wasteful number, since it uses less digits than its factorization.

3991752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55453 (or 55446 counting only the distinct ones).

The product of its digits is 17010, while the sum is 36.

The square root of 3991752 is about 1997.9369359417. The cubic root of 3991752 is about 158.6309227520.

The spelling of 3991752 in words is "three million, nine hundred ninety-one thousand, seven hundred fifty-two".