999845 has 32 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 611520.

The previous prime is 999809. The next prime is 999853. The reversal of 999845 is 548999.

999845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999845 - 2¹⁴ = 983461 is a prime.

Its product of digits (116640) is a multiple of the sum of its prime factors (90).

It is a Curzon number.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 999796 and 999805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18839 + ... + 18891.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2⁹⁹⁹⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

999845 is a deficient number, since it is larger than the sum of its proper divisors (555355).

999845 is a wasteful number, since it uses less digits than its factorization.

999845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 76 counting only the distinct ones).

The product of its digits is 116640, while the sum is 44.

The square root of 999845 is about 999.9224969966. The cubic root of 999845 is about 99.9948330664.

The spelling of 999845 in words is "nine hundred ninety-nine thousand, eight hundred forty-five".