3131840 has 28 divisors (see below), whose sum is σ = 7458456. Its totient is φ = 1252608.

The previous prime is 3131833. The next prime is 3131851. The reversal of 3131840 is 481313.

It is a happy number.

3131840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4574 + ... + 5213.

Almost surely, 2^3131840 is an apocalyptic number.

It is an amenable number.

3131840 is an abundant number, since it is smaller than the sum of its proper divisors (4326616).

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

3131840 is an equidigital number, since it uses as much as digits as its factorization.

3131840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9804 (or 9794 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 3131840 is about 1769.7005396394. The cubic root of 3131840 is about 146.3074773471.

The spelling of 3131840 in words is "three million, one hundred thirty-one thousand, eight hundred forty".