999147 has 4 divisors (see below), whose sum is σ = 1332200. Its totient is φ = 666096.

The previous prime is 999133. The next prime is 999149. The reversal of 999147 is 741999.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 999147 - 2⁶ = 999083 is a prime.

It is a D-number.

It is a Duffinian number.

999147 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999147.

It is not an unprimeable number, because it can be changed into a prime (999149) 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, 166522 + ... + 166527.

It is an arithmetic number, because the mean of its divisors is an integer number (333050).

2⁹⁹⁹¹⁴⁷ is an apocalyptic number.

999147 is a deficient number, since it is larger than the sum of its proper divisors (333053).

999147 is a wasteful number, since it uses less digits than its factorization.

999147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333052.

The product of its digits is 20412, while the sum is 39.

The square root of 999147 is about 999.5734090101. The cubic root of 999147 is about 99.9715585783.

The spelling of 999147 in words is "nine hundred ninety-nine thousand, one hundred forty-seven".