2311043240 has 128 divisors (see below), whose sum is σ = 6027955200. Its totient is φ = 788090880.

The previous prime is 2311043237. The next prime is 2311043279. The reversal of 2311043240 is 423401132.

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

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3807017 + ... + 3807623.

It is an arithmetic number, because the mean of its divisors is an integer number (47093400).

Almost surely, 2^2311043240 is an apocalyptic number.

2311043240 is a gapful number since it is divisible by the number (20) 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 2311043240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3013977600).

2311043240 is an abundant number, since it is smaller than the sum of its proper divisors (3716911960).

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

2311043240 is a wasteful number, since it uses less digits than its factorization.

2311043240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155 (or 1151 counting only the distinct ones).

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

The square root of 2311043240 is about 48073.3110987791. The cubic root of 2311043240 is about 1322.1153792107.

Adding to 2311043240 its reverse (423401132), we get a palindrome (2734444372).

The spelling of 2311043240 in words is "two billion, three hundred eleven million, forty-three thousand, two hundred forty".