999216 has 60 divisors (see below), whose sum is σ = 2911272. Its totient is φ = 331776.

The previous prime is 999199. The next prime is 999217. The reversal of 999216 is 612999.

It is a super-2 number, since 2×999216² = 1996865229312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 2 and base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999216.

It is not an unprimeable number, because it can be changed into a prime (999217) by changing a digit.

999216 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3760 + ... + 4016.

2⁹⁹⁹²¹⁶ 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 999216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1455636).

999216 is an abundant number, since it is smaller than the sum of its proper divisors (1912056).

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

999216 is a wasteful number, since it uses less digits than its factorization.

999216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 262 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 999216 is about 999.6079231379. The cubic root of 999216 is about 99.9738598342.

It can be divided in two parts, 9 and 99216, that added together give a square (99225 = 315²).

The spelling of 999216 in words is "nine hundred ninety-nine thousand, two hundred sixteen".