998404 has 12 divisors (see below), whose sum is σ = 1906128. Its totient is φ = 453800.

The previous prime is 998399. The next prime is 998411. The reversal of 998404 is 404899.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 998404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11302 + ... + 11389.

It is an arithmetic number, because the mean of its divisors is an integer number (158844).

2⁹⁹⁸⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

998404 is a deficient number, since it is larger than the sum of its proper divisors (907724).

998404 is a wasteful number, since it uses less digits than its factorization.

998404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22706 (or 22704 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 998404 is about 999.2016813437. The cubic root of 998404 is about 99.9467716725.

Subtracting from 998404 its product of nonzero digits (10368), we obtain a square (988036 = 994²).

Subtracting from 998404 its reverse (404899), we obtain a triangular number (593505 = T₁₀₈₉).

The spelling of 998404 in words is "nine hundred ninety-eight thousand, four hundred four".