3243440 has 20 divisors (see below), whose sum is σ = 7541184. Its totient is φ = 1297344.

The previous prime is 3243397. The next prime is 3243467. The reversal of 3243440 is 443423.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20192 + ... + 20351.

Almost surely, 2^3243440 is an apocalyptic number.

It is an amenable number.

3243440 is an abundant number, since it is smaller than the sum of its proper divisors (4297744).

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

3243440 is a wasteful number, since it uses less digits than its factorization.

3243440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40556 (or 40550 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 3243440 is about 1800.9553020550. The cubic root of 3243440 is about 148.0250748846.

Adding to 3243440 its reverse (443423), we get a palindrome (3686863).

The spelling of 3243440 in words is "three million, two hundred forty-three thousand, four hundred forty".