999223992 has 192 divisors, whose sum is σ = 3106022400. Its totient is φ = 297198720.

The previous prime is 999223933. The next prime is 999223993. The reversal of 999223992 is 299322999.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999223993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1131183 + ... + 1132065.

It is an arithmetic number, because the mean of its divisors is an integer number (16177200).

Almost surely, 2^999223992 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 999223992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1553011200).

999223992 is an abundant number, since it is smaller than the sum of its proper divisors (2106798408).

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

999223992 is a wasteful number, since it uses less digits than its factorization.

999223992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955 (or 932 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 54.

The square root of 999223992 is about 31610.5044565885. The cubic root of 999223992 is about 999.7412637280.

The spelling of 999223992 in words is "nine hundred ninety-nine million, two hundred twenty-three thousand, nine hundred ninety-two".