198163977 has 16 divisors (see below), whose sum is σ = 303409920. Its totient is φ = 113778000.

The previous prime is 198163969. The next prime is 198164003. The reversal of 198163977 is 779361891.

It is not a de Polignac number, because 198163977 - 2³ = 198163969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198163907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157399 + ... + 158652.

It is an arithmetic number, because the mean of its divisors is an integer number (18963120).

Almost surely, 2^198163977 is an apocalyptic number.

It is an amenable number.

198163977 is a deficient number, since it is larger than the sum of its proper divisors (105245943).

198163977 is a wasteful number, since it uses less digits than its factorization.

198163977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316084.

The product of its digits is 571536, while the sum is 51.

The square root of 198163977 is about 14077.0727425839. The cubic root of 198163977 is about 583.0085222656.

The spelling of 198163977 in words is "one hundred ninety-eight million, one hundred sixty-three thousand, nine hundred seventy-seven".