1998604 has 12 divisors (see below), whose sum is σ = 3555328. Its totient is φ = 982800.

The previous prime is 1998589. The next prime is 1998611. The reversal of 1998604 is 4068991.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3852 + ... + 4339.

2^1998604 is an apocalyptic number.

It is an amenable number.

1998604 is a deficient number, since it is larger than the sum of its proper divisors (1556724).

1998604 is a wasteful number, since it uses less digits than its factorization.

1998604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8256 (or 8254 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1998604 is about 1413.7199156834. The cubic root of 1998604 is about 125.9627840033.

The spelling of 1998604 in words is "one million, nine hundred ninety-eight thousand, six hundred four".