999997722 has 12 divisors (see below), whose sum is σ = 2166661770. Its totient is φ = 333332568.

The previous prime is 999997717. The next prime is 999997769. The reversal of 999997722 is 227799999.

999997722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 750705201 + 249292521 = 27399^2 + 15789^2 .

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999997722.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27777697 + ... + 27777732.

Almost surely, 2^999997722 is an apocalyptic number.

999997722 is an abundant number, since it is smaller than the sum of its proper divisors (1166664048).

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

999997722 is a wasteful number, since it uses less digits than its factorization.

999997722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55555437 (or 55555434 counting only the distinct ones).

The product of its digits is 11573604, while the sum is 63.

The square root of 999997722 is about 31622.7405833207. The cubic root of 999997722 is about 999.9992406661. Note that the first 3 decimals are identical.

It can be divided in two parts, 9999977 and 22, that added together give a palindrome (9999999).

The spelling of 999997722 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred twenty-two".