198896987 has 4 divisors (see below), whose sum is σ = 200721840. Its totient is φ = 197072136.

The previous prime is 198896983. The next prime is 198896989. The reversal of 198896987 is 789698891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789698891 = 383 ⋅2061877.

It is a cyclic number.

It is not a de Polignac number, because 198896987 - 2² = 198896983 is a prime.

It is a super-2 number, since 2×198896987² = 79120022875356338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198896981) 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, 912263 + ... + 912480.

It is an arithmetic number, because the mean of its divisors is an integer number (50180460).

Almost surely, 2^198896987 is an apocalyptic number.

198896987 is a deficient number, since it is larger than the sum of its proper divisors (1824853).

198896987 is a wasteful number, since it uses less digits than its factorization.

198896987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824852.

The product of its digits is 15676416, while the sum is 65.

The square root of 198896987 is about 14103.0843080512. The cubic root of 198896987 is about 583.7264886666.

The spelling of 198896987 in words is "one hundred ninety-eight million, eight hundred ninety-six thousand, nine hundred eighty-seven".