999849 has 4 divisors (see below), whose sum is σ = 1333136. Its totient is φ = 666564.

The previous prime is 999809. The next prime is 999853. The reversal of 999849 is 948999.

It is a happy number.

999849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 999849 - 2⁷ = 999721 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999798 and 999807.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999849.

It is not an unprimeable number, because it can be changed into a prime (999809) 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, 166639 + ... + 166644.

It is an arithmetic number, because the mean of its divisors is an integer number (333284).

2⁹⁹⁹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

999849 is a deficient number, since it is larger than the sum of its proper divisors (333287).

999849 is a wasteful number, since it uses less digits than its factorization.

999849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333286.

The product of its digits is 209952, while the sum is 48.

The square root of 999849 is about 999.9244971497. The cubic root of 999849 is about 99.9949664133.

The spelling of 999849 in words is "nine hundred ninety-nine thousand, eight hundred forty-nine".