198732287 has 4 divisors (see below), whose sum is σ = 214019400. Its totient is φ = 183445176.

The previous prime is 198732271. The next prime is 198732307. The reversal of 198732287 is 782237891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782237891 = 857 ⋅912763.

It is a cyclic number.

It is not a de Polignac number, because 198732287 - 2⁴ = 198732271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198732487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7643537 + ... + 7643562.

It is an arithmetic number, because the mean of its divisors is an integer number (53504850).

Almost surely, 2^198732287 is an apocalyptic number.

198732287 is a deficient number, since it is larger than the sum of its proper divisors (15287113).

198732287 is a wasteful number, since it uses less digits than its factorization.

198732287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15287112.

The product of its digits is 338688, while the sum is 47.

The square root of 198732287 is about 14097.2439505032. The cubic root of 198732287 is about 583.5653226563.

The spelling of 198732287 in words is "one hundred ninety-eight million, seven hundred thirty-two thousand, two hundred eighty-seven".