198999671 has 16 divisors (see below), whose sum is σ = 229277664. Its totient is φ = 171085824.

The previous prime is 198999649. The next prime is 198999677. The reversal of 198999671 is 176999891.

It is a de Polignac number, because none of the positive numbers 2^k-198999671 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198999671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198999677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16796 + ... + 26078.

It is an arithmetic number, because the mean of its divisors is an integer number (14329854).

Almost surely, 2^198999671 is an apocalyptic number.

198999671 is a deficient number, since it is larger than the sum of its proper divisors (30277993).

198999671 is a wasteful number, since it uses less digits than its factorization.

198999671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410.

The product of its digits is 2204496, while the sum is 59.

The square root of 198999671 is about 14106.7243185652. The cubic root of 198999671 is about 583.8269243406.

The spelling of 198999671 in words is "one hundred ninety-eight million, nine hundred ninety-nine thousand, six hundred seventy-one".