198491474 has 4 divisors (see below), whose sum is σ = 297737214. Its totient is φ = 99245736.

The previous prime is 198491471. The next prime is 198491477. The reversal of 198491474 is 474194891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 474194891 = 47 ⋅10089253.

It is an interprime number because it is at equal distance from previous prime (198491471) and next prime (198491477).

It can be written as a sum of positive squares in only one way, i.e., 146579449 + 51912025 = 12107^2 + 7205^2 .

It is not an unprimeable number, because it can be changed into a prime (198491471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49622867 + ... + 49622870.

Almost surely, 2^198491474 is an apocalyptic number.

198491474 is a deficient number, since it is larger than the sum of its proper divisors (99245740).

198491474 is an equidigital number, since it uses as much as digits as its factorization.

198491474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99245739.

The product of its digits is 290304, while the sum is 47.

The square root of 198491474 is about 14088.7002239383. The cubic root of 198491474 is about 583.3295164558.

The spelling of 198491474 in words is "one hundred ninety-eight million, four hundred ninety-one thousand, four hundred seventy-four".