198794989 has 4 divisors (see below), whose sum is σ = 200312640. Its totient is φ = 197277340.

The previous prime is 198794983. The next prime is 198794993. The reversal of 198794989 is 989497891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989497891 = 571 ⋅1732921.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198794989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198794989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198794983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758629 + ... + 758890.

It is an arithmetic number, because the mean of its divisors is an integer number (50078160).

Almost surely, 2^198794989 is an apocalyptic number.

It is an amenable number.

198794989 is a deficient number, since it is larger than the sum of its proper divisors (1517651).

198794989 is a wasteful number, since it uses less digits than its factorization.

198794989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517650.

The product of its digits is 11757312, while the sum is 64.

The square root of 198794989 is about 14099.4676849873. The cubic root of 198794989 is about 583.6266897443.

The spelling of 198794989 in words is "one hundred ninety-eight million, seven hundred ninety-four thousand, nine hundred eighty-nine".