994809 has 4 divisors (see below), whose sum is σ = 1326416. Its totient is φ = 663204.

The previous prime is 994793. The next prime is 994811. The reversal of 994809 is 908499.

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: 908499 = 3 ⋅302833.

It is not a de Polignac number, because 994809 - 2⁴ = 994793 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 994809.

It is not an unprimeable number, because it can be changed into a prime (994879) 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, 165799 + ... + 165804.

It is an arithmetic number, because the mean of its divisors is an integer number (331604).

2⁹⁹⁴⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

994809 is a deficient number, since it is larger than the sum of its proper divisors (331607).

994809 is a wasteful number, since it uses less digits than its factorization.

994809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331606.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 994809 is about 997.4011229190. The cubic root of 994809 is about 99.8266663949.

The spelling of 994809 in words is "nine hundred ninety-four thousand, eight hundred nine".