198158697 has 32 divisors (see below), whose sum is σ = 322008960. Its totient is φ = 119439360.

The previous prime is 198158689. The next prime is 198158707. The reversal of 198158697 is 796851891.

It is not a de Polignac number, because 198158697 - 2³ = 198158689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198158677) 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 31 ways as a sum of consecutive naturals, for example, 55593 + ... + 59049.

It is an arithmetic number, because the mean of its divisors is an integer number (10062780).

Almost surely, 2^198158697 is an apocalyptic number.

It is an amenable number.

198158697 is a deficient number, since it is larger than the sum of its proper divisors (123850263).

198158697 is a wasteful number, since it uses less digits than its factorization.

198158697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670 (or 3664 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 54.

The square root of 198158697 is about 14076.8852023450. The cubic root of 198158697 is about 583.0033442099.

The spelling of 198158697 in words is "one hundred ninety-eight million, one hundred fifty-eight thousand, six hundred ninety-seven".