999817816 has 24 divisors (see below), whose sum is σ = 1905951060. Its totient is φ = 491699040.

The previous prime is 999817813. The next prime is 999817817. The reversal of 999817816 is 618718999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999817813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12975 + ... + 46561.

Almost surely, 2^999817816 is an apocalyptic number.

It is an amenable number.

999817816 is a deficient number, since it is larger than the sum of its proper divisors (906133244).

999817816 is a wasteful number, since it uses less digits than its factorization.

999817816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33715 (or 33650 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 58.

The square root of 999817816 is about 31619.8958885067. The cubic root of 999817816 is about 999.9392683117.

The spelling of 999817816 in words is "nine hundred ninety-nine million, eight hundred seventeen thousand, eight hundred sixteen".