2031312440 has 64 divisors (see below), whose sum is σ = 4637131200. Its totient is φ = 800750592.

The previous prime is 2031312431. The next prime is 2031312443. The reversal of 2031312440 is 442131302.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031312443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 942404 + ... + 944556.

It is an arithmetic number, because the mean of its divisors is an integer number (72455175).

Almost surely, 2^2031312440 is an apocalyptic number.

2031312440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2031312440 is an abundant number, since it is smaller than the sum of its proper divisors (2605818760).

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

2031312440 is a wasteful number, since it uses less digits than its factorization.

2031312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496 (or 2492 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2031312440 is about 45070.0836475816. The cubic root of 2031312440 is about 1266.4622313957.

Adding to 2031312440 its reverse (442131302), we get a palindrome (2473443742).

The spelling of 2031312440 in words is "two billion, thirty-one million, three hundred twelve thousand, four hundred forty".