999603 has 24 divisors (see below), whose sum is σ = 1647360. Its totient is φ = 578160.

The previous prime is 999599. The next prime is 999611. The reversal of 999603 is 306999.

999603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999603 - 2² = 999599 is a prime.

999603 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999603.

It is not an unprimeable number, because it can be changed into a prime (999613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2058 + ... + 2496.

It is an arithmetic number, because the mean of its divisors is an integer number (68640).

2⁹⁹⁹⁶⁰³ is an apocalyptic number.

999603 is a deficient number, since it is larger than the sum of its proper divisors (647757).

999603 is a wasteful number, since it uses less digits than its factorization.

999603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 999603 is about 999.8014802950. The cubic root of 999603 is about 99.9867649151.

The spelling of 999603 in words is "nine hundred ninety-nine thousand, six hundred three".