198805487 has 2 divisors, whose sum is σ = 198805488. Its totient is φ = 198805486.

The previous prime is 198805483. The next prime is 198805507. The reversal of 198805487 is 784508891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198805487 - 2² = 198805483 is a prime.

It is a super-2 number, since 2×198805487² = 79047243322614338, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198805483) 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 as a sum of consecutive naturals, namely, 99402743 + 99402744.

It is an arithmetic number, because the mean of its divisors is an integer number (99402744).

Almost surely, 2^198805487 is an apocalyptic number.

198805487 is a deficient number, since it is larger than the sum of its proper divisors (1).

198805487 is an equidigital number, since it uses as much as digits as its factorization.

198805487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 50.

The square root of 198805487 is about 14099.8399636308. The cubic root of 198805487 is about 583.6369629831.

The spelling of 198805487 in words is "one hundred ninety-eight million, eight hundred five thousand, four hundred eighty-seven".