999636812 has 12 divisors (see below), whose sum is σ = 1763139840. Its totient is φ = 495882576.

The previous prime is 999636793. The next prime is 999636821. The reversal of 999636812 is 218636999.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983387 + ... + 984402.

It is an arithmetic number, because the mean of its divisors is an integer number (146928320).

Almost surely, 2^999636812 is an apocalyptic number.

It is an amenable number.

999636812 is a deficient number, since it is larger than the sum of its proper divisors (763503028).

999636812 is a wasteful number, since it uses less digits than its factorization.

999636812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967920 (or 1967918 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 53.

The square root of 999636812 is about 31617.0335736925. The cubic root of 999636812 is about 999.8789226742.

The spelling of 999636812 in words is "nine hundred ninety-nine million, six hundred thirty-six thousand, eight hundred twelve".