3287991 has 16 divisors (see below), whose sum is σ = 5184000. Its totient is φ = 1813728.

The previous prime is 3287989. The next prime is 3288023. The reversal of 3287991 is 1997823.

It is not a de Polignac number, because 3287991 - 2¹ = 3287989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3287941) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2091 + ... + 3308.

It is an arithmetic number, because the mean of its divisors is an integer number (324000).

Almost surely, 2^3287991 is an apocalyptic number.

3287991 is a deficient number, since it is larger than the sum of its proper divisors (1896009).

3287991 is a wasteful number, since it uses less digits than its factorization.

3287991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438.

The product of its digits is 27216, while the sum is 39.

The square root of 3287991 is about 1813.2818313765. The cubic root of 3287991 is about 148.6997391571.

It can be divided in two parts, 3287 and 991, that added together give a triangular number (4278 = T₉₂).

The spelling of 3287991 in words is "three million, two hundred eighty-seven thousand, nine hundred ninety-one".