198658379 has 4 divisors (see below), whose sum is σ = 210344184. Its totient is φ = 186972576.

The previous prime is 198658373. The next prime is 198658423. The reversal of 198658379 is 973856891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198658379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198658373) 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, 5842877 + ... + 5842910.

It is an arithmetic number, because the mean of its divisors is an integer number (52586046).

Almost surely, 2^198658379 is an apocalyptic number.

198658379 is a deficient number, since it is larger than the sum of its proper divisors (11685805).

198658379 is a wasteful number, since it uses less digits than its factorization.

198658379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11685804.

The product of its digits is 3265920, while the sum is 56.

The square root of 198658379 is about 14094.6223432911. The cubic root of 198658379 is about 583.4929715648.

The spelling of 198658379 in words is "one hundred ninety-eight million, six hundred fifty-eight thousand, three hundred seventy-nine".