1028440503 has 16 divisors (see below), whose sum is σ = 1559050240. Its totient is φ = 669681432.

The previous prime is 1028440499. The next prime is 1028440507. The reversal of 1028440503 is 3050448201.

It is an interprime number because it is at equal distance from previous prime (1028440499) and next prime (1028440507).

It is not a de Polignac number, because 1028440503 - 2² = 1028440499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028440507) 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 15 ways as a sum of consecutive naturals, for example, 441751 + ... + 444072.

It is an arithmetic number, because the mean of its divisors is an integer number (97440640).

Almost surely, 2^1028440503 is an apocalyptic number.

1028440503 is a deficient number, since it is larger than the sum of its proper divisors (530609737).

1028440503 is an equidigital number, since it uses as much as digits as its factorization.

1028440503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885875 (or 885869 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1028440503 is about 32069.3078035682. The cubic root of 1028440503 is about 1009.3916877405.

Adding to 1028440503 its reverse (3050448201), we get a palindrome (4078888704).

The spelling of 1028440503 in words is "one billion, twenty-eight million, four hundred forty thousand, five hundred three".