999404 has 18 divisors (see below), whose sum is σ = 2034900. Its totient is φ = 428232.

The previous prime is 999389. The next prime is 999431. The reversal of 999404 is 404999.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999404.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2354 + ... + 2745.

It is an arithmetic number, because the mean of its divisors is an integer number (113050).

2⁹⁹⁹⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

999404 is an abundant number, since it is smaller than the sum of its proper divisors (1035496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999404 is a wasteful number, since it uses less digits than its factorization.

999404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5117 (or 5108 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 999404 is about 999.7019555848. The cubic root of 999404 is about 99.9801293852.

The spelling of 999404 in words is "nine hundred ninety-nine thousand, four hundred four".