999800616 has 128 divisors (see below), whose sum is σ = 2679091200. Its totient is φ = 310252800.

The previous prime is 999800597. The next prime is 999800687. The reversal of 999800616 is 616008999.

999800616 = T₁ + T₂ + ... + T₁₈₁₆.

999800616 is a nontrivial binomial coefficient, being equal to C(1818, 3).

It is an unprimeable number.

It is the 1816-th tetrahedral number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4404295 + ... + 4404521.

It is an arithmetic number, because the mean of its divisors is an integer number (20930400).

Almost surely, 2^999800616 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 999800616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339545600).

999800616 is an abundant number, since it is smaller than the sum of its proper divisors (1679290584).

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

999800616 is a wasteful number, since it uses less digits than its factorization.

999800616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 999800616 is about 31619.6239066817. The cubic root of 999800616 is about 999.9335342491.

The spelling of 999800616 in words is "nine hundred ninety-nine million, eight hundred thousand, six hundred sixteen".