990404 has 6 divisors (see below), whose sum is σ = 1733214. Its totient is φ = 495200.

The previous prime is 990397. The next prime is 990463. The reversal of 990404 is 404099.

990404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 906304 + 84100 = 952^2 + 290^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123797 + ... + 123804.

It is an arithmetic number, because the mean of its divisors is an integer number (288869).

2⁹⁹⁰⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

990404 is a deficient number, since it is larger than the sum of its proper divisors (742810).

990404 is a wasteful number, since it uses less digits than its factorization.

990404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247605 (or 247603 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 990404 is about 995.1904340376. The cubic root of 990404 is about 99.6791046968.

The spelling of 990404 in words is "nine hundred ninety thousand, four hundred four".