999727998 has 32 divisors (see below), whose sum is σ = 2026045440. Its totient is φ = 328839840.

The previous prime is 999727987. The next prime is 999727999. The reversal of 999727998 is 899727999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999727999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142108 + ... + 148976.

It is an arithmetic number, because the mean of its divisors is an integer number (63313920).

Almost surely, 2^999727998 is an apocalyptic number.

999727998 is an abundant number, since it is smaller than the sum of its proper divisors (1026317442).

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

999727998 is a wasteful number, since it uses less digits than its factorization.

999727998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7192.

The product of its digits is 46294416, while the sum is 69.

The square root of 999727998 is about 31618.4755799517. The cubic root of 999727998 is about 999.9093244449.

Subtracting from 999727998 its reverse (899727999), we obtain a palindrome (99999999).

The spelling of 999727998 in words is "nine hundred ninety-nine million, seven hundred twenty-seven thousand, nine hundred ninety-eight".