9999812 has 6 divisors (see below), whose sum is σ = 17499678.
Its totient is φ = 4999904.
The previous prime is 9999761. The next prime is 9999823. The reversal of 9999812 is 2189999.
It can be written as a sum of positive squares in only one way, i.e., 7761796 + 2238016 = 2786^2 + 1496^2
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1249973 + ... + 1249980.
It is an arithmetic number, because the mean of its divisors is an integer number (2916613).
Almost surely, 29999812 is an apocalyptic number.
It is an amenable number.
9999812 is a deficient number, since it is larger than the sum of its proper divisors (7499866).
9999812 is a wasteful number, since it uses less digits than its factorization.
9999812 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2499957 (or 2499955 counting only the distinct ones).
The product of its digits is 104976, while the sum is 47.
The square root of 9999812 is about 3162.2479346187.
The cubic root of 9999812 is about 215.4421188823.
The spelling of 9999812 in words is "nine million, nine hundred ninety-nine thousand, eight hundred twelve".