198955887 has 16 divisors (see below), whose sum is σ = 286940640. Its totient is φ = 121894272.

The previous prime is 198955877. The next prime is 198955901. The reversal of 198955887 is 788559891.

It is not a de Polignac number, because 198955887 - 2⁴ = 198955871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198955887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198955807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2208 + ... + 20069.

It is an arithmetic number, because the mean of its divisors is an integer number (17933790).

Almost surely, 2^198955887 is an apocalyptic number.

198955887 is a deficient number, since it is larger than the sum of its proper divisors (87984753).

198955887 is a wasteful number, since it uses less digits than its factorization.

198955887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22522.

The product of its digits is 7257600, while the sum is 60.

The square root of 198955887 is about 14105.1723491774. The cubic root of 198955887 is about 583.7841032429.

The spelling of 198955887 in words is "one hundred ninety-eight million, nine hundred fifty-five thousand, eight hundred eighty-seven".