198145784 has 32 divisors (see below), whose sum is σ = 381659040. Its totient is φ = 96384000.

The previous prime is 198145771. The next prime is 198145789. The reversal of 198145784 is 487541891.

It is a super-3 number, since 3×198145784³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198145789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164384 + ... + 165584.

It is an arithmetic number, because the mean of its divisors is an integer number (11926845).

Almost surely, 2^198145784 is an apocalyptic number.

It is an amenable number.

198145784 is a deficient number, since it is larger than the sum of its proper divisors (183513256).

198145784 is a wasteful number, since it uses less digits than its factorization.

198145784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751 (or 1747 counting only the distinct ones).

The product of its digits is 322560, while the sum is 47.

The square root of 198145784 is about 14076.4265351686. The cubic root of 198145784 is about 582.9906801417.

The spelling of 198145784 in words is "one hundred ninety-eight million, one hundred forty-five thousand, seven hundred eighty-four".