998547993 has 12 divisors (see below), whose sum is σ = 1495767728. Its totient is φ = 665698500.

The previous prime is 998547917. The next prime is 998547997. The reversal of 998547993 is 399745899.

It is a happy number.

It is not a de Polignac number, because 998547993 - 2⁹ = 998547481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 998547993.

It is not an unprimeable number, because it can be changed into a prime (998547997) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2054383 + ... + 2054868.

Almost surely, 2^998547993 is an apocalyptic number.

It is an amenable number.

998547993 is a deficient number, since it is larger than the sum of its proper divisors (497219735).

998547993 is an equidigital number, since it uses as much as digits as its factorization.

998547993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109266 (or 4109254 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 63.

The square root of 998547993 is about 31599.8100152517. The cubic root of 998547993 is about 999.5157632193.

The spelling of 998547993 in words is "nine hundred ninety-eight million, five hundred forty-seven thousand, nine hundred ninety-three".