998597983 has 4 divisors (see below), whose sum is σ = 1010629368. Its totient is φ = 986566600.

The previous prime is 998597981. The next prime is 998597989. The reversal of 998597983 is 389795899.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 998597983 - 2¹ = 998597981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998597981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6015568 + ... + 6015733.

It is an arithmetic number, because the mean of its divisors is an integer number (252657342).

Almost surely, 2^998597983 is an apocalyptic number.

998597983 is a deficient number, since it is larger than the sum of its proper divisors (12031385).

998597983 is a wasteful number, since it uses less digits than its factorization.

998597983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12031384.

The product of its digits is 44089920, while the sum is 67.

The square root of 998597983 is about 31600.6009911204. The cubic root of 998597983 is about 999.5324424240.

The spelling of 998597983 in words is "nine hundred ninety-eight million, five hundred ninety-seven thousand, nine hundred eighty-three".