999812 has 24 divisors (see below), whose sum is σ = 1972992. Its totient is φ = 439200.

The previous prime is 999809. The next prime is 999853. The reversal of 999812 is 218999.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998 + ... + 1730.

It is an arithmetic number, because the mean of its divisors is an integer number (82208).

2⁹⁹⁹⁸¹² is an apocalyptic number.

It is an amenable number.

999812 is a deficient number, since it is larger than the sum of its proper divisors (973180).

999812 is a wasteful number, since it uses less digits than its factorization.

999812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 777 counting only the distinct ones).

The product of its digits is 11664, while the sum is 38.

The square root of 999812 is about 999.9059955816. The cubic root of 999812 is about 99.9937329406.

The spelling of 999812 in words is "nine hundred ninety-nine thousand, eight hundred twelve".