198821293 has 8 divisors (see below), whose sum is σ = 221940576. Its totient is φ = 176542800.

The previous prime is 198821281. The next prime is 198821297. The reversal of 198821293 is 392128891.

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

It is a cyclic number.

It is not a de Polignac number, because 198821293 - 2⁵ = 198821261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198821297) 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 7 ways as a sum of consecutive naturals, for example, 209698 + ... + 210643.

It is an arithmetic number, because the mean of its divisors is an integer number (27742572).

Almost surely, 2^198821293 is an apocalyptic number.

It is an amenable number.

198821293 is a deficient number, since it is larger than the sum of its proper divisors (23119283).

198821293 is a wasteful number, since it uses less digits than its factorization.

198821293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420395.

The product of its digits is 62208, while the sum is 43.

The square root of 198821293 is about 14100.4004553062. The cubic root of 198821293 is about 583.6524298958.

The spelling of 198821293 in words is "one hundred ninety-eight million, eight hundred twenty-one thousand, two hundred ninety-three".