19990503 has 32 divisors (see below), whose sum is σ = 32177600. Its totient is φ = 12265344.

The previous prime is 19990501. The next prime is 19990507. The reversal of 19990503 is 30509991.

It is not a de Polignac number, because 19990503 - 2¹ = 19990501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59151 + ... + 59487.

It is an arithmetic number, because the mean of its divisors is an integer number (1005550).

Almost surely, 2^19990503 is an apocalyptic number.

19990503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19990503 is a deficient number, since it is larger than the sum of its proper divisors (12187097).

19990503 is an equidigital number, since it uses as much as digits as its factorization.

19990503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 19990503 is about 4471.0740320420. The cubic root of 19990503 is about 271.3987901503.

The spelling of 19990503 in words is "nineteen million, nine hundred ninety thousand, five hundred three".