990403 has 12 divisors (see below), whose sum is σ = 1105200. Its totient is φ = 885632.

The previous prime is 990397. The next prime is 990463. The reversal of 990403 is 304099.

It is not a de Polignac number, because 990403 - 2⁵ = 990371 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (990463) 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, 6573 + ... + 6721.

It is an arithmetic number, because the mean of its divisors is an integer number (92100).

2⁹⁹⁰⁴⁰³ is an apocalyptic number.

990403 is a deficient number, since it is larger than the sum of its proper divisors (114797).

990403 is a wasteful number, since it uses less digits than its factorization.

990403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 990403 is about 995.1899316211. The cubic root of 990403 is about 99.6790711485.

The spelling of 990403 in words is "nine hundred ninety thousand, four hundred three".