198679977 has 6 divisors (see below), whose sum is σ = 286982202. Its totient is φ = 132453312.

The previous prime is 198679937. The next prime is 198679997. The reversal of 198679977 is 779976891.

It can be written as a sum of positive squares in only one way, i.e., 197711721 + 968256 = 14061^2 + 984^2 .

It is not a de Polignac number, because 198679977 - 2⁶ = 198679913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198679937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11037768 + ... + 11037785.

It is an arithmetic number, because the mean of its divisors is an integer number (47830367).

Almost surely, 2^198679977 is an apocalyptic number.

It is an amenable number.

198679977 is a deficient number, since it is larger than the sum of its proper divisors (88302225).

198679977 is a wasteful number, since it uses less digits than its factorization.

198679977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22075559 (or 22075556 counting only the distinct ones).

The product of its digits is 12002256, while the sum is 63.

The square root of 198679977 is about 14095.3885012085. The cubic root of 198679977 is about 583.5141164477.

The spelling of 198679977 in words is "one hundred ninety-eight million, six hundred seventy-nine thousand, nine hundred seventy-seven".