198340279 has 4 divisors (see below), whose sum is σ = 198371680. Its totient is φ = 198308880.

The previous prime is 198340277. The next prime is 198340283. The reversal of 198340279 is 972043891.

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

It is a cyclic number.

It is not a de Polignac number, because 198340279 - 2¹ = 198340277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198340273) 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, 2559 + ... + 20080.

It is an arithmetic number, because the mean of its divisors is an integer number (49592920).

Almost surely, 2^198340279 is an apocalyptic number.

198340279 is a deficient number, since it is larger than the sum of its proper divisors (31401).

198340279 is an equidigital number, since it uses as much as digits as its factorization.

198340279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31400.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 198340279 is about 14083.3333767258. Note that the first 4 decimals coincide. The cubic root of 198340279 is about 583.1813675074.

The spelling of 198340279 in words is "one hundred ninety-eight million, three hundred forty thousand, two hundred seventy-nine".