3213440 has 32 divisors (see below), whose sum is σ = 7683660. Its totient is φ = 1285120.

The previous prime is 3213439. The next prime is 3213473. The reversal of 3213440 is 443123.

It can be written as a sum of positive squares in 2 ways, for example, as 3125824 + 87616 = 1768^2 + 296^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 1871 + ... + 3150.

Almost surely, 2^3213440 is an apocalyptic number.

It is an amenable number.

3213440 is an abundant number, since it is smaller than the sum of its proper divisors (4470220).

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

3213440 is an equidigital number, since it uses as much as digits as its factorization.

3213440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5040 (or 5028 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 3213440 is about 1792.6070400397. The cubic root of 3213440 is about 147.5672775535.

Adding to 3213440 its reverse (443123), we get a palindrome (3656563).

The spelling of 3213440 in words is "three million, two hundred thirteen thousand, four hundred forty".