198374879 has 2 divisors, whose sum is σ = 198374880. Its totient is φ = 198374878.

The previous prime is 198374861. The next prime is 198374893. The reversal of 198374879 is 978473891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198374879 - 2¹⁶ = 198309343 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198374809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99187439 + 99187440.

It is an arithmetic number, because the mean of its divisors is an integer number (99187440).

Almost surely, 2^198374879 is an apocalyptic number.

198374879 is a deficient number, since it is larger than the sum of its proper divisors (1).

198374879 is an equidigital number, since it uses as much as digits as its factorization.

198374879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 56.

The square root of 198374879 is about 14084.5617255206. The cubic root of 198374879 is about 583.2152770797.

The spelling of 198374879 in words is "one hundred ninety-eight million, three hundred seventy-four thousand, eight hundred seventy-nine".