3280921 has 4 divisors (see below), whose sum is σ = 3749632. Its totient is φ = 2812212.

The previous prime is 3280903. The next prime is 3280957. The reversal of 3280921 is 1290823.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3280921 - 2⁵ = 3280889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3280961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234345 + ... + 234358.

It is an arithmetic number, because the mean of its divisors is an integer number (937408).

Almost surely, 2^3280921 is an apocalyptic number.

It is an amenable number.

3280921 is a deficient number, since it is larger than the sum of its proper divisors (468711).

3280921 is an equidigital number, since it uses as much as digits as its factorization.

3280921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468710.

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

The square root of 3280921 is about 1811.3312783696. The cubic root of 3280921 is about 148.5930821761.

The spelling of 3280921 in words is "three million, two hundred eighty thousand, nine hundred twenty-one".