999222000 has 320 divisors, whose sum is σ = 3787090944. Its totient is φ = 221875200.

The previous prime is 999221983. The next prime is 999222001. The reversal of 999222000 is 222999.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999222001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1553679 + ... + 1554321.

Almost surely, 2^999222000 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 999222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1893545472).

999222000 is an abundant number, since it is smaller than the sum of its proper divisors (2787868944).

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

999222000 is a wasteful number, since it uses less digits than its factorization.

999222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713 (or 697 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 999222000 is about 31610.4729480595. The cubic root of 999222000 is about 999.7405993838.

Adding to 999222000 its reverse (222999), we get a palindrome (999444999).

The spelling of 999222000 in words is "nine hundred ninety-nine million, two hundred twenty-two thousand".