2312040440 has 32 divisors (see below), whose sum is σ = 5212730160. Its totient is φ = 922924800.

The previous prime is 2312040427. The next prime is 2312040449. The reversal of 2312040440 is 440402132.

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 (2312040449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39221 + ... + 78500.

Almost surely, 2^2312040440 is an apocalyptic number.

2312040440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2312040440 is an abundant number, since it is smaller than the sum of its proper divisors (2900689720).

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

2312040440 is a wasteful number, since it uses less digits than its factorization.

2312040440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118223 (or 118219 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 2312040440 is about 48083.6816394086. The cubic root of 2312040440 is about 1322.3055132376.

Adding to 2312040440 its reverse (440402132), we get a palindrome (2752442572).

The spelling of 2312040440 in words is "two billion, three hundred twelve million, forty thousand, four hundred forty".