999994000009 has 9 divisors (see below), whose sum is σ = 1002075313941. Its totient is φ = 997917006240.

The previous prime is 999993999997. The next prime is 999994000037. The reversal of 999994000009 is 900000499999.

The square root of 999994000009 is 999997.

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

It can be written as a sum of positive squares in 4 ways, for example, as 345467695225 + 654526304784 = 587765^2 + 809028^2 .

It is not a de Polignac number, because 999994000009 - 2³¹ = 997846516361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999994000099) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 756997069 + ... + 756998389.

It is an arithmetic number, because the mean of its divisors is an integer number (111341701549).

Almost surely, 2^999994000009 is an apocalyptic number.

999994000009 is the 999997-th square number.

999994000009 is the 499999-th centered octagonal number.

It is an amenable number.

999994000009 is a deficient number, since it is larger than the sum of its proper divisors (2081313932).

999994000009 is an frugal number, since it uses more digits than its factorization.

999994000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156 (or 2078 counting only the distinct ones).

The product of its (nonzero) digits is 2125764, while the sum is 58.

The spelling of 999994000009 in words is "nine hundred ninety-nine billion, nine hundred ninety-four million, nine", and thus it is an aban number.