503999989 has 6 divisors (see below), whose sum is σ = 526866326. Its totient is φ = 482086440.

The previous prime is 503999971. The next prime is 504000011. The reversal of 503999989 is 989999305.

It can be written as a sum of positive squares in only one way, i.e., 502880625 + 1119364 = 22425^2 + 1058^2 .

It is not a de Polignac number, because 503999989 - 2¹⁵ = 503967221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503999939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 475842 + ... + 476899.

Almost surely, 2^503999989 is an apocalyptic number.

It is an amenable number.

503999989 is a deficient number, since it is larger than the sum of its proper divisors (22866337).

503999989 is an equidigital number, since it uses as much as digits as its factorization.

503999989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952787 (or 952764 counting only the distinct ones).

The product of its (nonzero) digits is 7085880, while the sum is 61.

The square root of 503999989 is about 22449.9440756542. The cubic root of 503999989 is about 795.8114357896.

The spelling of 503999989 in words is "five hundred three million, nine hundred ninety-nine thousand, nine hundred eighty-nine".