3231440 has 40 divisors (see below), whose sum is σ = 7761408. Its totient is φ = 1249920.

The previous prime is 3231433. The next prime is 3231443. The reversal of 3231440 is 441323.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3231443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1829 + ... + 3131.

Almost surely, 2^3231440 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 3231440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3880704).

3231440 is an abundant number, since it is smaller than the sum of its proper divisors (4529968).

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

3231440 is a wasteful number, since it uses less digits than its factorization.

3231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347 (or 1341 counting only the distinct ones).

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

The square root of 3231440 is about 1797.6206496366. The cubic root of 3231440 is about 147.8422961013.

Adding to 3231440 its reverse (441323), we get a palindrome (3672763).

The spelling of 3231440 in words is "three million, two hundred thirty-one thousand, four hundred forty".