198940105 has 32 divisors (see below), whose sum is σ = 294739200. Its totient is φ = 125528832.

The previous prime is 198940099. The next prime is 198940109. The reversal of 198940105 is 501049891.

It is not a de Polignac number, because 198940105 - 2³ = 198940097 is a prime.

It is a super-2 number, since 2×198940105² = 79154330754822050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (198940109) 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, 231166 + ... + 232024.

It is an arithmetic number, because the mean of its divisors is an integer number (9210600).

Almost surely, 2^198940105 is an apocalyptic number.

It is an amenable number.

198940105 is a deficient number, since it is larger than the sum of its proper divisors (95799095).

198940105 is a wasteful number, since it uses less digits than its factorization.

198940105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 198940105 is about 14104.6128979139. The cubic root of 198940105 is about 583.7686667820.

Adding to 198940105 its reverse (501049891), we get a palindrome (699989996).

The spelling of 198940105 in words is "one hundred ninety-eight million, nine hundred forty thousand, one hundred five".