999403 has 4 divisors (see below), whose sum is σ = 1011528. Its totient is φ = 987280.

The previous prime is 999389. The next prime is 999431. The reversal of 999403 is 304999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 999403 - 2⁵ = 999371 is a prime.

It is a Duffinian number.

999403 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (999433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5938 + ... + 6103.

It is an arithmetic number, because the mean of its divisors is an integer number (252882).

2⁹⁹⁹⁴⁰³ is an apocalyptic number.

999403 is a deficient number, since it is larger than the sum of its proper divisors (12125).

999403 is a wasteful number, since it uses less digits than its factorization.

999403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12124.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 999403 is about 999.7014554356. The cubic root of 999403 is about 99.9800960386.

The spelling of 999403 in words is "nine hundred ninety-nine thousand, four hundred three".