198383791 has 4 divisors (see below), whose sum is σ = 198414072. Its totient is φ = 198353512.

The previous prime is 198383777. The next prime is 198383797. The reversal of 198383791 is 197383891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197383891 = 9661 ⋅20431.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198383791 is a prime.

It is a super-2 number, since 2×198383791² = 78712257063063362, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198383797) 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, 760 + ... + 19933.

It is an arithmetic number, because the mean of its divisors is an integer number (49603518).

Almost surely, 2^198383791 is an apocalyptic number.

198383791 is a deficient number, since it is larger than the sum of its proper divisors (30281).

198383791 is an equidigital number, since it uses as much as digits as its factorization.

198383791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30280.

The product of its digits is 326592, while the sum is 49.

The square root of 198383791 is about 14084.8780967391. The cubic root of 198383791 is about 583.2240106060.

The spelling of 198383791 in words is "one hundred ninety-eight million, three hundred eighty-three thousand, seven hundred ninety-one".