3281920 has 44 divisors (see below), whose sum is σ = 7885044. Its totient is φ = 1310720.

The previous prime is 3281911. The next prime is 3281933. The reversal of 3281920 is 291823.

It can be written as a sum of positive squares in 2 ways, for example, as 2166784 + 1115136 = 1472^2 + 1056^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4800 + ... + 5440.

Almost surely, 2^3281920 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 3281920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3942522).

3281920 is an abundant number, since it is smaller than the sum of its proper divisors (4603124).

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

3281920 is an equidigital number, since it uses as much as digits as its factorization.

3281920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 648 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 3281920 is about 1811.6070214039. The cubic root of 3281920 is about 148.6081622329.

The spelling of 3281920 in words is "three million, two hundred eighty-one thousand, nine hundred twenty".