816003 has 12 divisors (see below), whose sum is σ = 1196208. Its totient is φ = 535920.

The previous prime is 815989. The next prime is 816019. The reversal of 816003 is 300618.

816003 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

816003 is a nontrivial binomial coefficient, being equal to C(1278, 2).

It is not a de Polignac number, because 816003 - 2⁶ = 815939 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (816043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1 + ... + 1277.

It is an arithmetic number, because the mean of its divisors is an integer number (99684).

2⁸¹⁶⁰⁰³ is an apocalyptic number.

816003 is the 1277-th triangular number and also the 639-th hexagonal number.

816003 is a deficient number, since it is larger than the sum of its proper divisors (380205).

816003 is a wasteful number, since it uses less digits than its factorization.

816003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 816003 is about 903.3288437773. The cubic root of 816003 is about 93.4466890848.

It can be divided in two parts, 81 and 6003, that added together give a square (6084 = 78²).

The spelling of 816003 in words is "eight hundred sixteen thousand, three".