999790 has 32 divisors (see below), whose sum is σ = 2008800. Its totient is φ = 355200.

The previous prime is 999773. The next prime is 999809. The reversal of 999790 is 97999.

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 15 ways as a sum of consecutive naturals, for example, 6636 + ... + 6784.

It is an arithmetic number, because the mean of its divisors is an integer number (62775).

2⁹⁹⁹⁷⁹⁰ is an apocalyptic number.

999790 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999790 is a wasteful number, since it uses less digits than its factorization.

999790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 999790 is about 999.8949944869. The cubic root of 999790 is about 99.9929995099.

It can be divided in two parts, 99 and 9790, that added together give a palindrome (9889).

The spelling of 999790 in words is "nine hundred ninety-nine thousand, seven hundred ninety".