999859896 has 192 divisors, whose sum is σ = 3421504800. Its totient is φ = 268821504.

The previous prime is 999859877. The next prime is 999859919. The reversal of 999859896 is 698958999.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 177150 + ... + 182706.

Almost surely, 2^999859896 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 999859896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1710752400).

999859896 is an abundant number, since it is smaller than the sum of its proper divisors (2421644904).

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

999859896 is a wasteful number, since it uses less digits than its factorization.

999859896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603 (or 5586 counting only the distinct ones).

The product of its digits is 113374080, while the sum is 72.

The square root of 999859896 is about 31620.5612853409. The cubic root of 999859896 is about 999.9532964855.

The spelling of 999859896 in words is "nine hundred ninety-nine million, eight hundred fifty-nine thousand, eight hundred ninety-six".