994009 has 3 divisors (see below), whose sum is σ = 995007. Its totient is φ = 993012.

The previous prime is 993997. The next prime is 994013. The reversal of 994009 is 900499.

The square root of 994009 is 997.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 900499 = 769 ⋅1171.

It can be written as a sum of positive squares in only one way, i.e., 855625 + 138384 = 925^2 + 372^2 .

It is not a de Polignac number, because 994009 - 2⁵ = 993977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (994039) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 499 + ... + 1495.

It is an arithmetic number, because the mean of its divisors is an integer number (331669).

2⁹⁹⁴⁰⁰⁹ is an apocalyptic number.

994009 is the 997-th square number.

994009 is the 499-th centered octagonal number.

It is an amenable number.

994009 is a deficient number, since it is larger than the sum of its proper divisors (998).

994009 is an frugal number, since it uses more digits than its factorization.

994009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994 (or 997 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The cubic root of 994009 is about 99.7998998664.

Multiplying 994009 by its product of nonzero digits (2916), we get a square (2898530244 = 53838²).

The spelling of 994009 in words is "nine hundred ninety-four thousand, nine".