999916840 has 128 divisors (see below), whose sum is σ = 2502783360. Its totient is φ = 357202944.

The previous prime is 999916807. The next prime is 999916859. The reversal of 999916840 is 48619999.

999916840 is a nontrivial binomial coefficient, being equal to C(44720, 2).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4404807 + ... + 4405033.

It is an arithmetic number, because the mean of its divisors is an integer number (19552995).

Almost surely, 2^999916840 is an apocalyptic number.

999916840 is the 44719-th triangular number and also the 22360-th hexagonal number.

999916840 is the 14907-th centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999916840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1251391680).

999916840 is an abundant number, since it is smaller than the sum of its proper divisors (1502866520).

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

999916840 is a wasteful number, since it uses less digits than its factorization.

999916840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 999916840 is about 31621.4616992953. The cubic root of 999916840 is about 999.9722792316.

The spelling of 999916840 in words is "nine hundred ninety-nine million, nine hundred sixteen thousand, eight hundred forty".