999722898 has 56 divisors (see below), whose sum is σ = 2257591500. Its totient is φ = 331871904.

The previous prime is 999722891. The next prime is 999722903. The reversal of 999722898 is 898227999.

It can be written as a sum of positive squares in 2 ways, for example, as 999634689 + 88209 = 31617^2 + 297^2 .

It is a super-3 number, since 3×999722898³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999722891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 390928 + ... + 393476.

Almost surely, 2^999722898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999722898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128795750).

999722898 is an abundant number, since it is smaller than the sum of its proper divisors (1257868602).

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

999722898 is a wasteful number, since it uses less digits than its factorization.

999722898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838 (or 2823 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 999722898 is about 31618.3949307994. The cubic root of 999722898 is about 999.9076241336.

The spelling of 999722898 in words is "nine hundred ninety-nine million, seven hundred twenty-two thousand, eight hundred ninety-eight".