5312123440 has 80 divisors (see below), whose sum is σ = 13488261696. Its totient is φ = 1933747200.

The previous prime is 5312123419. The next prime is 5312123449. The reversal of 5312123440 is 443212135.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (5312123449) 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, 37870 + ... + 109810.

Almost surely, 2^5312123440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5312123440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6744130848).

5312123440 is an abundant number, since it is smaller than the sum of its proper divisors (8176138256).

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

5312123440 is a wasteful number, since it uses less digits than its factorization.

5312123440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72038 (or 72032 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 5312123440 is about 72884.3154595006. The cubic root of 5312123440 is about 1744.8417838890.

Adding to 5312123440 its reverse (443212135), we get a palindrome (5755335575).

The spelling of 5312123440 in words is "five billion, three hundred twelve million, one hundred twenty-three thousand, four hundred forty".