512542440 has 144 divisors (see below), whose sum is σ = 1698617700. Its totient is φ = 134032896.

The previous prime is 512542439. The next prime is 512542451. The reversal of 512542440 is 44245215.

It can be written as a sum of positive squares in 2 ways, for example, as 497379204 + 15163236 = 22302^2 + 3894^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1252956 + ... + 1253364.

Almost surely, 2^512542440 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 512542440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (849308850).

512542440 is an abundant number, since it is smaller than the sum of its proper divisors (1186075260).

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

512542440 is a wasteful number, since it uses less digits than its factorization.

512542440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 512542440 is about 22639.4001687324. The cubic root of 512542440 is about 800.2824211195.

Adding to 512542440 its reverse (44245215), we get a palindrome (556787655).

The spelling of 512542440 in words is "five hundred twelve million, five hundred forty-two thousand, four hundred forty".