197911982 has 4 divisors (see below), whose sum is σ = 296867976. Its totient is φ = 98955990.

The previous prime is 197911969. The next prime is 197911991. The reversal of 197911982 is 289119791.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49477994 + ... + 49477997.

It is an arithmetic number, because the mean of its divisors is an integer number (74216994).

Almost surely, 2^197911982 is an apocalyptic number.

197911982 is a deficient number, since it is larger than the sum of its proper divisors (98955994).

197911982 is an equidigital number, since it uses as much as digits as its factorization.

197911982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98955993.

The product of its digits is 81648, while the sum is 47.

The square root of 197911982 is about 14068.1193483706. The cubic root of 197911982 is about 582.7612900597.

The spelling of 197911982 in words is "one hundred ninety-seven million, nine hundred eleven thousand, nine hundred eighty-two".