198865127 has 4 divisors (see below), whose sum is σ = 198895536. Its totient is φ = 198834720.

The previous prime is 198865097. The next prime is 198865181. The reversal of 198865127 is 721568891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 721568891 = 3301 ⋅218591.

It is a cyclic number.

It is not a de Polignac number, because 198865127 - 2¹² = 198861031 is a prime.

It is a super-2 number, since 2×198865127² = 79094677473452258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198865187) 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, 923 + ... + 19964.

It is an arithmetic number, because the mean of its divisors is an integer number (49723884).

Almost surely, 2^198865127 is an apocalyptic number.

198865127 is a deficient number, since it is larger than the sum of its proper divisors (30409).

198865127 is an equidigital number, since it uses as much as digits as its factorization.

198865127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30408.

The product of its digits is 241920, while the sum is 47.

The square root of 198865127 is about 14101.9547226617. The cubic root of 198865127 is about 583.6953192335.

The spelling of 198865127 in words is "one hundred ninety-eight million, eight hundred sixty-five thousand, one hundred twenty-seven".