990806 has 16 divisors (see below), whose sum is σ = 1563408. Its totient is φ = 470400.

The previous prime is 990799. The next prime is 990809. The reversal of 990806 is 608099.

It is a happy number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3386 + ... + 3666.

It is an arithmetic number, because the mean of its divisors is an integer number (97713).

2⁹⁹⁰⁸⁰⁶ is an apocalyptic number.

990806 is a deficient number, since it is larger than the sum of its proper divisors (572602).

990806 is a wasteful number, since it uses less digits than its factorization.

990806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 990806 is about 995.3923849417. The cubic root of 990806 is about 99.6925892882.

The spelling of 990806 in words is "nine hundred ninety thousand, eight hundred six".