999956772 has 96 divisors (see below), whose sum is σ = 2739340800. Its totient is φ = 314931456.

The previous prime is 999956767. The next prime is 999956773. The reversal of 999956772 is 277659999.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (999956773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143808 + ... + 150600.

It is an arithmetic number, because the mean of its divisors is an integer number (28534800).

Almost surely, 2^999956772 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 999956772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1369670400).

999956772 is an abundant number, since it is smaller than the sum of its proper divisors (1739384028).

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

999956772 is a wasteful number, since it uses less digits than its factorization.

999956772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6882 (or 6874 counting only the distinct ones).

The product of its digits is 19289340, while the sum is 63.

The square root of 999956772 is about 31622.0930996036. The cubic root of 999956772 is about 999.9855904590.

The spelling of 999956772 in words is "nine hundred ninety-nine million, nine hundred fifty-six thousand, seven hundred seventy-two".