3231540 has 72 divisors (see below), whose sum is σ = 10564008. Its totient is φ = 794880.

The previous prime is 3231521. The next prime is 3231541. The reversal of 3231540 is 451323.

3231540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 34596 + 3196944 = 186^2 + 1788^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3231541) 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 23 ways as a sum of consecutive naturals, for example, 1650 + ... + 3030.

Almost surely, 2^3231540 is an apocalyptic number.

3231540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3231540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5282004).

3231540 is an abundant number, since it is smaller than the sum of its proper divisors (7332468).

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

3231540 is a wasteful number, since it uses less digits than its factorization.

3231540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409 (or 1404 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 3231540 is about 1797.6484639662. The cubic root of 3231540 is about 147.8438211260.

Adding to 3231540 its reverse (451323), we get a palindrome (3682863).

The spelling of 3231540 in words is "three million, two hundred thirty-one thousand, five hundred forty".