198397287 has 54 divisors (see below), whose sum is σ = 332424456. Its totient is φ = 113720640.

The previous prime is 198397279. The next prime is 198397291. The reversal of 198397287 is 782793891.

It is not a de Polignac number, because 198397287 - 2³ = 198397279 is a prime.

It is a super-2 number, since 2×198397287² = 78722966977920738, which contains 22 as substring.

Its product of digits (1524096) is a multiple of the sum of its prime divisors (126).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198397247) 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 53 ways as a sum of consecutive naturals, for example, 2229139 + ... + 2229227.

Almost surely, 2^198397287 is an apocalyptic number.

198397287 is a deficient number, since it is larger than the sum of its proper divisors (134027169).

198397287 is a wasteful number, since it uses less digits than its factorization.

198397287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 126 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 198397287 is about 14085.3571839695. The cubic root of 198397287 is about 583.2372358343.

The spelling of 198397287 in words is "one hundred ninety-eight million, three hundred ninety-seven thousand, two hundred eighty-seven".