198645538 has 16 divisors (see below), whose sum is σ = 366730560. Its totient is φ = 78584976.

The previous prime is 198645523. The next prime is 198645571. The reversal of 198645538 is 835546891.

It is a junction number, because it is equal to n+sod(n) for n = 198645491 and 198645500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545548 + ... + 545911.

It is an arithmetic number, because the mean of its divisors is an integer number (22920660).

Almost surely, 2^198645538 is an apocalyptic number.

198645538 is a deficient number, since it is larger than the sum of its proper divisors (168085022).

198645538 is a wasteful number, since it uses less digits than its factorization.

198645538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091481.

The product of its digits is 1036800, while the sum is 49.

The square root of 198645538 is about 14094.1668075839. The cubic root of 198645538 is about 583.4803992371.

It can be divided in two parts, 1986 and 45538, that added together give a square (47524 = 218²).

The spelling of 198645538 in words is "one hundred ninety-eight million, six hundred forty-five thousand, five hundred thirty-eight".