998343905 has 16 divisors (see below), whose sum is σ = 1293004944. Its totient is φ = 735617280.

The previous prime is 998343817. The next prime is 998343949. The reversal of 998343905 is 509343899.

It can be written as a sum of positive squares in 8 ways, for example, as 193543744 + 804800161 = 13912^2 + 28369^2 .

It is a de Polignac number, because none of the positive numbers 2^k-998343905 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13307 + ... + 46623.

It is an arithmetic number, because the mean of its divisors is an integer number (80812809).

Almost surely, 2^998343905 is an apocalyptic number.

It is an amenable number.

998343905 is a deficient number, since it is larger than the sum of its proper divisors (294661039).

998343905 is a wasteful number, since it uses less digits than its factorization.

998343905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33796.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The square root of 998343905 is about 31596.5805903107. The cubic root of 998343905 is about 999.4476633137.

The spelling of 998343905 in words is "nine hundred ninety-eight million, three hundred forty-three thousand, nine hundred five".