198687274 has 4 divisors (see below), whose sum is σ = 298030914. Its totient is φ = 99343636.

The previous prime is 198687263. The next prime is 198687311. The reversal of 198687274 is 472786891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 472786891 = 479 ⋅987029.

It can be written as a sum of positive squares in only one way, i.e., 187498249 + 11189025 = 13693^2 + 3345^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 49671817 + ... + 49671820.

Almost surely, 2^198687274 is an apocalyptic number.

198687274 is a deficient number, since it is larger than the sum of its proper divisors (99343640).

198687274 is an equidigital number, since it uses as much as digits as its factorization.

198687274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99343639.

The product of its digits is 1354752, while the sum is 52.

The square root of 198687274 is about 14095.6473423536. The cubic root of 198687274 is about 583.5212600134.

The spelling of 198687274 in words is "one hundred ninety-eight million, six hundred eighty-seven thousand, two hundred seventy-four".