503121540 has 96 divisors (see below), whose sum is σ = 1435924224. Its totient is φ = 131604480.

The previous prime is 503121517. The next prime is 503121547. The reversal of 503121540 is 45121305.

It is not an unprimeable number, because it can be changed into a prime (503121547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 797025 + ... + 797655.

It is an arithmetic number, because the mean of its divisors is an integer number (14957544).

Almost surely, 2^503121540 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 503121540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (717962112).

503121540 is an abundant number, since it is smaller than the sum of its proper divisors (932802684).

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

503121540 is a wasteful number, since it uses less digits than its factorization.

503121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 503121540 is about 22430.3709287207. The cubic root of 503121540 is about 795.3488125597.

Adding to 503121540 its reverse (45121305), we get a palindrome (548242845).

The spelling of 503121540 in words is "five hundred three million, one hundred twenty-one thousand, five hundred forty".