198449999 has 4 divisors (see below), whose sum is σ = 216490920. Its totient is φ = 180409080.

The previous prime is 198449939. The next prime is 198450017. The reversal of 198449999 is 999944891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999944891 = 11 ⋅90904081.

It is a cyclic number.

It is not a de Polignac number, because 198449999 - 2⁸ = 198449743 is a prime.

It is a super-3 number, since 3×198449999³ (a number of 26 digits) contains 333 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 (198449939) 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, 9020444 + ... + 9020465.

It is an arithmetic number, because the mean of its divisors is an integer number (54122730).

Almost surely, 2^198449999 is an apocalyptic number.

198449999 is a deficient number, since it is larger than the sum of its proper divisors (18040921).

198449999 is a wasteful number, since it uses less digits than its factorization.

198449999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18040920.

The product of its digits is 7558272, while the sum is 62.

The square root of 198449999 is about 14087.2282227555. The cubic root of 198449999 is about 583.2888845225.

The spelling of 198449999 in words is "one hundred ninety-eight million, four hundred forty-nine thousand, nine hundred ninety-nine".