198921242 has 8 divisors (see below), whose sum is σ = 321334356. Its totient is φ = 91809792.

The previous prime is 198921223. The next prime is 198921251. The reversal of 198921242 is 242129891.

It can be written as a sum of positive squares in 2 ways, for example, as 197149681 + 1771561 = 14041^2 + 1331^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 198921196 and 198921205.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3825383 + ... + 3825434.

Almost surely, 2^198921242 is an apocalyptic number.

198921242 is a deficient number, since it is larger than the sum of its proper divisors (122413114).

198921242 is a wasteful number, since it uses less digits than its factorization.

198921242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7650832.

The product of its digits is 20736, while the sum is 38.

The square root of 198921242 is about 14103.9442001165. The cubic root of 198921242 is about 583.7502157070.

The spelling of 198921242 in words is "one hundred ninety-eight million, nine hundred twenty-one thousand, two hundred forty-two".