990104 has 16 divisors (see below), whose sum is σ = 1937520. Its totient is φ = 473440.

The previous prime is 990053. The next prime is 990137. The reversal of 990104 is 401099.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 990104.

It is a congruent number.

It is an unprimeable number.

990104 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2507 + ... + 2874.

It is an arithmetic number, because the mean of its divisors is an integer number (121095).

2⁹⁹⁰¹⁰⁴ is an apocalyptic number.

It is an amenable number.

990104 is a deficient number, since it is larger than the sum of its proper divisors (947416).

990104 is a wasteful number, since it uses less digits than its factorization.

990104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5410 (or 5406 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 990104 is about 995.0396977005. The cubic root of 990104 is about 99.6690391912.

The spelling of 990104 in words is "nine hundred ninety thousand, one hundred four".