3521440240 has 40 divisors (see below), whose sum is σ = 8618265360. Its totient is φ = 1334439936.

The previous prime is 3521440229. The next prime is 3521440243. The reversal of 3521440240 is 420441253.

It is a happy number.

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 (3521440243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1156849 + ... + 1159888.

It is an arithmetic number, because the mean of its divisors is an integer number (215456634).

Almost surely, 2^3521440240 is an apocalyptic number.

It is an amenable number.

3521440240 is an abundant number, since it is smaller than the sum of its proper divisors (5096825120).

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

3521440240 is a wasteful number, since it uses less digits than its factorization.

3521440240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2316769 (or 2316763 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 3521440240 is about 59341.7242755888. The cubic root of 3521440240 is about 1521.3884243580.

Adding to 3521440240 its reverse (420441253), we get a palindrome (3941881493).

The spelling of 3521440240 in words is "three billion, five hundred twenty-one million, four hundred forty thousand, two hundred forty".