999854 has 4 divisors (see below), whose sum is σ = 1499784. Its totient is φ = 499926.

The previous prime is 999853. The next prime is 999863. The reversal of 999854 is 458999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 458999 = 109 ⋅4211.

It is a nialpdrome in base 10.

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 999854.

It is not an unprimeable number, because it can be changed into a prime (999853) by changing a digit.

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 as a sum of consecutive naturals, namely, 249962 + ... + 249965.

It is an arithmetic number, because the mean of its divisors is an integer number (374946).

2⁹⁹⁹⁸⁵⁴ is an apocalyptic number.

999854 is a deficient number, since it is larger than the sum of its proper divisors (499930).

999854 is a wasteful number, since it uses less digits than its factorization.

999854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499929.

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

The square root of 999854 is about 999.9269973353. The cubic root of 999854 is about 99.9951330965.

The spelling of 999854 in words is "nine hundred ninety-nine thousand, eight hundred fifty-four".