198318725 has 12 divisors (see below), whose sum is σ = 268271520. Its totient is φ = 144231600.

The previous prime is 198318721. The next prime is 198318767. The reversal of 198318725 is 527813891.

It is not a de Polignac number, because 198318725 - 2² = 198318721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198318721) 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 11 ways as a sum of consecutive naturals, for example, 360305 + ... + 360854.

It is an arithmetic number, because the mean of its divisors is an integer number (22355960).

Almost surely, 2^198318725 is an apocalyptic number.

It is an amenable number.

198318725 is a deficient number, since it is larger than the sum of its proper divisors (69952795).

198318725 is a wasteful number, since it uses less digits than its factorization.

198318725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721180 (or 721175 counting only the distinct ones).

The product of its digits is 120960, while the sum is 44.

The square root of 198318725 is about 14082.5681251681. The cubic root of 198318725 is about 583.1602416143.

The spelling of 198318725 in words is "one hundred ninety-eight million, three hundred eighteen thousand, seven hundred twenty-five".