198340457 has 4 divisors (see below), whose sum is σ = 226674816. Its totient is φ = 170006100.

The previous prime is 198340453. The next prime is 198340501. The reversal of 198340457 is 754043891.

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.

It is a cyclic number.

It is not a de Polignac number, because 198340457 - 2² = 198340453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198340453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14167169 + ... + 14167182.

It is an arithmetic number, because the mean of its divisors is an integer number (56668704).

Almost surely, 2^198340457 is an apocalyptic number.

It is an amenable number.

198340457 is a deficient number, since it is larger than the sum of its proper divisors (28334359).

198340457 is an equidigital number, since it uses as much as digits as its factorization.

198340457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28334358.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 198340457 is about 14083.3396962510. The cubic root of 198340457 is about 583.1815419655.

The spelling of 198340457 in words is "one hundred ninety-eight million, three hundred forty thousand, four hundred fifty-seven".