198997982 has 24 divisors (see below), whose sum is σ = 320451960. Its totient is φ = 92400480.

The previous prime is 198997979. The next prime is 198998003. The reversal of 198997982 is 289799891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 679028 + ... + 679320.

It is an arithmetic number, because the mean of its divisors is an integer number (13352165).

Almost surely, 2^198997982 is an apocalyptic number.

198997982 is a deficient number, since it is larger than the sum of its proper divisors (121453978).

198997982 is an equidigital number, since it uses as much as digits as its factorization.

198997982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 375 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 62.

The square root of 198997982 is about 14106.6644533710. The cubic root of 198997982 is about 583.8252726017.

The spelling of 198997982 in words is "one hundred ninety-eight million, nine hundred ninety-seven thousand, nine hundred eighty-two".