512231440 has 80 divisors (see below), whose sum is σ = 1368483840. Its totient is φ = 174666240.

The previous prime is 512231389. The next prime is 512231449. The reversal of 512231440 is 44132215.

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 (512231449) 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, 104566 + ... + 109354.

It is an arithmetic number, because the mean of its divisors is an integer number (17106048).

Almost surely, 2^512231440 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 512231440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (684241920).

512231440 is an abundant number, since it is smaller than the sum of its proper divisors (856252400).

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

512231440 is a wasteful number, since it uses less digits than its factorization.

512231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000 (or 4994 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 512231440 is about 22632.5305699562. The cubic root of 512231440 is about 800.1205235084.

Adding to 512231440 its reverse (44132215), we get a palindrome (556363655).

The spelling of 512231440 in words is "five hundred twelve million, two hundred thirty-one thousand, four hundred forty".