198997822 has 8 divisors (see below), whose sum is σ = 299178000. Its totient is φ = 99271824.

The previous prime is 198997819. The next prime is 198997823. The reversal of 198997822 is 228799891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198997823) 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 3 ways as a sum of consecutive naturals, for example, 112447 + ... + 114202.

It is an arithmetic number, because the mean of its divisors is an integer number (37397250).

Almost surely, 2^198997822 is an apocalyptic number.

198997822 is a deficient number, since it is larger than the sum of its proper divisors (100180178).

198997822 is a wasteful number, since it uses less digits than its factorization.

198997822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227090.

The product of its digits is 1306368, while the sum is 55.

The square root of 198997822 is about 14106.6587822914. The cubic root of 198997822 is about 583.8251161310.

The spelling of 198997822 in words is "one hundred ninety-eight million, nine hundred ninety-seven thousand, eight hundred twenty-two".