999894 has 48 divisors (see below), whose sum is σ = 2462400. Its totient is φ = 269136.

The previous prime is 999883. The next prime is 999907. The reversal of 999894 is 498999.

It is a happy number.

It is a super-2 number, since 2×999894² = 1999576022472, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999894.

It is an unprimeable number.

999894 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5497 + ... + 5675.

It is an arithmetic number, because the mean of its divisors is an integer number (51300).

2⁹⁹⁹⁸⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1231200).

999894 is an abundant number, since it is smaller than the sum of its proper divisors (1462506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999894 is a wasteful number, since it uses less digits than its factorization.

999894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 210 counting only the distinct ones).

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

The square root of 999894 is about 999.9469985954. The cubic root of 999894 is about 99.9964665418.

The spelling of 999894 in words is "nine hundred ninety-nine thousand, eight hundred ninety-four".