3121640240 has 40 divisors (see below), whose sum is σ = 7283694528. Its totient is φ = 1244203520.

The previous prime is 3121640237. The next prime is 3121640257. The reversal of 3121640240 is 420461213.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46952 + ... + 91911.

Almost surely, 2^3121640240 is an apocalyptic number.

It is an amenable number.

3121640240 is an abundant number, since it is smaller than the sum of its proper divisors (4162054288).

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

3121640240 is a wasteful number, since it uses less digits than its factorization.

3121640240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139157 (or 139151 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 3121640240 is about 55871.6407491314. The cubic root of 3121640240 is about 1461.4847346739.

The spelling of 3121640240 in words is "three billion, one hundred twenty-one million, six hundred forty thousand, two hundred forty".