198978585 has 32 divisors (see below), whose sum is σ = 346284288. Its totient is φ = 96979200.

The previous prime is 198978569. The next prime is 198978601. The reversal of 198978585 is 585879891.

198978585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (198978569) and next prime (198978601).

It is not a de Polignac number, because 198978585 - 2⁴ = 198978569 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14644 + ... + 24746.

It is an arithmetic number, because the mean of its divisors is an integer number (10821384).

Almost surely, 2^198978585 is an apocalyptic number.

198978585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198978585 is a deficient number, since it is larger than the sum of its proper divisors (147305703).

198978585 is a wasteful number, since it uses less digits than its factorization.

198978585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10225.

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

The square root of 198978585 is about 14105.9769246940. The cubic root of 198978585 is about 583.8063028503.

It can be divided in two parts, 19897 and 8585, that added together give a palindrome (28482).

The spelling of 198978585 in words is "one hundred ninety-eight million, nine hundred seventy-eight thousand, five hundred eighty-five".