198907 has 4 divisors (see below), whose sum is σ = 199800. Its totient is φ = 198016.

The previous prime is 198901. The next prime is 198929. The reversal of 198907 is 709891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 198907 - 2³ = 198899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198901) 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, 219 + ... + 667.

It is an arithmetic number, because the mean of its divisors is an integer number (49950).

2¹⁹⁸⁹⁰⁷ is an apocalyptic number.

198907 is a deficient number, since it is larger than the sum of its proper divisors (893).

198907 is an equidigital number, since it uses as much as digits as its factorization.

198907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 198907 is about 445.9899101998. The cubic root of 198907 is about 58.3736283947.

The spelling of 198907 in words is "one hundred ninety-eight thousand, nine hundred seven".