99603 has 32 divisors (see below), whose sum is σ = 184320. Its totient is φ = 51840.

The previous prime is 99581. The next prime is 99607. The reversal of 99603 is 30699.

It is not a de Polignac number, because 99603 - 2⁵ = 99571 is a prime.

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

99603 is a Rhonda number in base 14.

99603 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (99607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3198 + ... + 3228.

It is an arithmetic number, because the mean of its divisors is an integer number (5760).

2⁹⁹⁶⁰³ is an apocalyptic number.

99603 is a gapful number since it is divisible by the number (93) formed by its first and last digit.

99603 is a deficient number, since it is larger than the sum of its proper divisors (84717).

99603 is a wasteful number, since it uses less digits than its factorization.

99603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 99603 is about 315.5994296573. The cubic root of 99603 is about 46.3543831801.

The spelling of 99603 in words is "ninety-nine thousand, six hundred three".