999957816 has 384 divisors, whose sum is σ = 3502699200. Its totient is φ = 252887040.

The previous prime is 999957779. The next prime is 999957841. The reversal of 999957816 is 618759999.

999957816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5075830 + ... + 5076026.

Almost surely, 2^999957816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999957816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1751349600).

999957816 is an abundant number, since it is smaller than the sum of its proper divisors (2502741384).

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

999957816 is a wasteful number, since it uses less digits than its factorization.

999957816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 272 counting only the distinct ones).

The product of its digits is 11022480, while the sum is 63.

The square root of 999957816 is about 31622.1096070455. The cubic root of 999957816 is about 999.9859384689.

The spelling of 999957816 in words is "nine hundred ninety-nine million, nine hundred fifty-seven thousand, eight hundred sixteen".