198951799 has 12 divisors (see below), whose sum is σ = 215568864. Its totient is φ = 182897472.

The previous prime is 198951787. The next prime is 198951821. The reversal of 198951799 is 997159891.

It is a happy number.

It is not a de Polignac number, because 198951799 - 2⁷ = 198951671 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 (198952799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 398452 + ... + 398950.

It is an arithmetic number, because the mean of its divisors is an integer number (17964072).

Almost surely, 2^198951799 is an apocalyptic number.

198951799 is a deficient number, since it is larger than the sum of its proper divisors (16617065).

198951799 is an frugal number, since it uses more digits than its factorization.

198951799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062 (or 563 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 58.

The square root of 198951799 is about 14105.0274370524. The cubic root of 198951799 is about 583.7801048260.

The spelling of 198951799 in words is "one hundred ninety-eight million, nine hundred fifty-one thousand, seven hundred ninety-nine".