9999816 has 16 divisors (see below), whose sum is σ = 24999600. Its totient is φ = 3333264.

The previous prime is 9999761. The next prime is 9999823. The reversal of 9999816 is 6189999.

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, 208306 + ... + 208353.

It is an arithmetic number, because the mean of its divisors is an integer number (1562475).

Almost surely, 2^9999816 is an apocalyptic number.

It is an amenable number.

9999816 is an abundant number, since it is smaller than the sum of its proper divisors (14999784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9999816 is a wasteful number, since it uses less digits than its factorization.

9999816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416668 (or 416664 counting only the distinct ones).

The product of its digits is 314928, while the sum is 51.

The square root of 9999816 is about 3162.2485670801. The cubic root of 9999816 is about 215.4421476085.

The spelling of 9999816 in words is "nine million, nine hundred ninety-nine thousand, eight hundred sixteen".