2311231440 has 320 divisors, whose sum is σ = 8768010240. Its totient is φ = 491857920.

The previous prime is 2311231427. The next prime is 2311231451. The reversal of 2311231440 is 441321132.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1946527 + ... + 1947713.

It is an arithmetic number, because the mean of its divisors is an integer number (27400032).

Almost surely, 2^2311231440 is an apocalyptic number.

2311231440 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 2311231440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4384005120).

2311231440 is an abundant number, since it is smaller than the sum of its proper divisors (6456778800).

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

2311231440 is a wasteful number, since it uses less digits than its factorization.

2311231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 2311231440 is about 48075.2684859898. The cubic root of 2311231440 is about 1322.1512670955.

Adding to 2311231440 its reverse (441321132), we get a palindrome (2752552572).

The spelling of 2311231440 in words is "two billion, three hundred eleven million, two hundred thirty-one thousand, four hundred forty".