816903 has 12 divisors (see below), whose sum is σ = 1190280. Its totient is φ = 539856.

The previous prime is 816899. The next prime is 816911. The reversal of 816903 is 309618.

It is not a de Polignac number, because 816903 - 2² = 816899 is a prime.

It is a super-2 number, since 2×816903² = 1334661022818, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 925 + ... + 1577.

It is an arithmetic number, because the mean of its divisors is an integer number (99190).

2⁸¹⁶⁹⁰³ is an apocalyptic number.

816903 is a deficient number, since it is larger than the sum of its proper divisors (373377).

816903 is a wasteful number, since it uses less digits than its factorization.

816903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 816903 is about 903.8268639513. The cubic root of 816903 is about 93.4810317361.

The spelling of 816903 in words is "eight hundred sixteen thousand, nine hundred three".