996809 has 4 divisors (see below), whose sum is σ = 1087440. Its totient is φ = 906180.

The previous prime is 996803. The next prime is 996811. The reversal of 996809 is 908699.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908699 = 11 ⋅82609.

It is a de Polignac number, because none of the positive numbers 2^k-996809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (996803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45299 + ... + 45320.

It is an arithmetic number, because the mean of its divisors is an integer number (271860).

2⁹⁹⁶⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

996809 is a deficient number, since it is larger than the sum of its proper divisors (90631).

996809 is a wasteful number, since it uses less digits than its factorization.

996809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90630.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 996809 is about 998.4032251550. The cubic root of 996809 is about 99.8935199937.

The spelling of 996809 in words is "nine hundred ninety-six thousand, eight hundred nine".