198978982 has 16 divisors (see below), whose sum is σ = 332659440. Its totient is φ = 88708608.

The previous prime is 198978973. The next prime is 198979009. The reversal of 198978982 is 289879891.

It is a self number, because there is not a number n which added to its sum of digits gives 198978982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153363 + ... + 154654.

It is an arithmetic number, because the mean of its divisors is an integer number (20791215).

Almost surely, 2^198978982 is an apocalyptic number.

198978982 is a deficient number, since it is larger than the sum of its proper divisors (133680458).

198978982 is a wasteful number, since it uses less digits than its factorization.

198978982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308055.

The product of its digits is 5225472, while the sum is 61.

The square root of 198978982 is about 14105.9909967361. The cubic root of 198978982 is about 583.8066911181.

Subtracting 198978982 from its reverse (289879891), we obtain a palindrome (90900909).

The spelling of 198978982 in words is "one hundred ninety-eight million, nine hundred seventy-eight thousand, nine hundred eighty-two".