998817729 has 16 divisors (see below), whose sum is σ = 1639085952. Its totient is φ = 526848768.

The previous prime is 998817691. The next prime is 998817731. The reversal of 998817729 is 927718899.

It is not a de Polignac number, because 998817729 - 2¹⁵ = 998784961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998897729) 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 15 ways as a sum of consecutive naturals, for example, 1829064 + ... + 1829609.

It is an arithmetic number, because the mean of its divisors is an integer number (102442872).

Almost surely, 2^998817729 is an apocalyptic number.

It is an amenable number.

998817729 is a deficient number, since it is larger than the sum of its proper divisors (640268223).

998817729 is a wasteful number, since it uses less digits than its factorization.

998817729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658696.

The product of its digits is 4572288, while the sum is 60.

The square root of 998817729 is about 31604.0777274073. The cubic root of 998817729 is about 999.6057542574.

The spelling of 998817729 in words is "nine hundred ninety-eight million, eight hundred seventeen thousand, seven hundred twenty-nine".