198390239983 has 4 divisors (see below), whose sum is σ = 213651027688. Its totient is φ = 183129452280.

The previous prime is 198390239951. The next prime is 198390240017. The reversal of 198390239983 is 389932093891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389932093891 = 69427 ⋅5616433.

It is a cyclic number.

It is not a de Polignac number, because 198390239983 - 2⁵ = 198390239951 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 (198390239933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7630393833 + ... + 7630393858.

It is an arithmetic number, because the mean of its divisors is an integer number (53412756922).

Almost surely, 2^198390239983 is an apocalyptic number.

198390239983 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

198390239983 is a deficient number, since it is larger than the sum of its proper divisors (15260787705).

198390239983 is a wasteful number, since it uses less digits than its factorization.

198390239983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15260787704.

The product of its (nonzero) digits is 22674816, while the sum is 64.

The spelling of 198390239983 in words is "one hundred ninety-eight billion, three hundred ninety million, two hundred thirty-nine thousand, nine hundred eighty-three".