999443172 has 96 divisors (see below), whose sum is σ = 2905039872. Its totient is φ = 260390016.

The previous prime is 999443171. The next prime is 999443191. The reversal of 999443172 is 271344999.

It is a happy number.

999443172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (999443171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85123 + ... + 96149.

It is an arithmetic number, because the mean of its divisors is an integer number (30260832).

Almost surely, 2^999443172 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 999443172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1452519936).

999443172 is an abundant number, since it is smaller than the sum of its proper divisors (1905596700).

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

999443172 is a wasteful number, since it uses less digits than its factorization.

999443172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11137 (or 11135 counting only the distinct ones).

The product of its digits is 489888, while the sum is 48.

The square root of 999443172 is about 31613.9711520081. The cubic root of 999443172 is about 999.8143562052.

The spelling of 999443172 in words is "nine hundred ninety-nine million, four hundred forty-three thousand, one hundred seventy-two".