999947 has 4 divisors (see below), whose sum is σ = 1076880. Its totient is φ = 923016.

The previous prime is 999931. The next prime is 999953. The reversal of 999947 is 749999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749999 = 443 ⋅1693.

It is a cyclic number.

It is not a de Polignac number, because 999947 - 2⁴ = 999931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999907) 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, 38447 + ... + 38472.

It is an arithmetic number, because the mean of its divisors is an integer number (269220).

2⁹⁹⁹⁹⁴⁷ is an apocalyptic number.

999947 is a deficient number, since it is larger than the sum of its proper divisors (76933).

999947 is a wasteful number, since it uses less digits than its factorization.

999947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76932.

The product of its digits is 183708, while the sum is 47.

The square root of 999947 is about 999.9734996489. The cubic root of 999947 is about 99.9982333021.

It can be divided in two parts, 99994 and 7, that added together give a palindrome (100001).

The spelling of 999947 in words is "nine hundred ninety-nine thousand, nine hundred forty-seven".