990406 has 8 divisors (see below), whose sum is σ = 1500624. Its totient is φ = 490200.

The previous prime is 990397. The next prime is 990463. The reversal of 990406 is 604099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable 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, 2250 + ... + 2653.

It is an arithmetic number, because the mean of its divisors is an integer number (187578).

2⁹⁹⁰⁴⁰⁶ is an apocalyptic number.

990406 is a deficient number, since it is larger than the sum of its proper divisors (510218).

990406 is a wasteful number, since it uses less digits than its factorization.

990406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5006.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 990406 is about 995.1914388699. The cubic root of 990406 is about 99.6791717934.

The spelling of 990406 in words is "nine hundred ninety thousand, four hundred six".