3256921 has 4 divisors (see below), whose sum is σ = 3262644. Its totient is φ = 3251200.

The previous prime is 3256889. The next prime is 3256927. The reversal of 3256921 is 1296523.

3256921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1729225 + 1527696 = 1315^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 3256921 - 2⁵ = 3256889 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3256921.

It is not an unprimeable number, because it can be changed into a prime (3256927) 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 3 ways as a sum of consecutive naturals, for example, 1900 + ... + 3181.

It is an arithmetic number, because the mean of its divisors is an integer number (815661).

Almost surely, 2^3256921 is an apocalyptic number.

It is an amenable number.

3256921 is a deficient number, since it is larger than the sum of its proper divisors (5723).

3256921 is an equidigital number, since it uses as much as digits as its factorization.

3256921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5722.

The product of its digits is 3240, while the sum is 28.

The square root of 3256921 is about 1804.6941569141. The cubic root of 3256921 is about 148.2298746932.

It can be divided in two parts, 32 and 56921, that added together give a triangular number (56953 = T₃₃₇).

The spelling of 3256921 in words is "three million, two hundred fifty-six thousand, nine hundred twenty-one".