198397977 has 8 divisors (see below), whose sum is σ = 276032064. Its totient is φ = 126514608.

The previous prime is 198397949. The next prime is 198397987. The reversal of 198397977 is 779793891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198397977 - 2¹⁴ = 198381593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198397977.

It is not an unprimeable number, because it can be changed into a prime (198397987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1437598 + ... + 1437735.

It is an arithmetic number, because the mean of its divisors is an integer number (34504008).

Almost surely, 2^198397977 is an apocalyptic number.

It is an amenable number.

198397977 is a deficient number, since it is larger than the sum of its proper divisors (77634087).

198397977 is a wasteful number, since it uses less digits than its factorization.

198397977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2875359.

The product of its digits is 6001128, while the sum is 60.

The square root of 198397977 is about 14085.3816774697. The cubic root of 198397977 is about 583.2379119746.

The spelling of 198397977 in words is "one hundred ninety-eight million, three hundred ninety-seven thousand, nine hundred seventy-seven".