999447 has 8 divisors (see below), whose sum is σ = 1411056. Its totient is φ = 627072.

The previous prime is 999437. The next prime is 999451. The reversal of 999447 is 744999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999447 - 2⁴ = 999431 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 999399 and 999408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9748 + ... + 9849.

It is an arithmetic number, because the mean of its divisors is an integer number (176382).

2⁹⁹⁹⁴⁴⁷ is an apocalyptic number.

999447 is a deficient number, since it is larger than the sum of its proper divisors (411609).

999447 is a wasteful number, since it uses less digits than its factorization.

999447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19617.

The product of its digits is 81648, while the sum is 42.

The square root of 999447 is about 999.7234617633. The cubic root of 999447 is about 99.9815632677.

The spelling of 999447 in words is "nine hundred ninety-nine thousand, four hundred forty-seven".