198180855 has 12 divisors (see below), whose sum is σ = 343513560. Its totient is φ = 105696432.

The previous prime is 198180847. The next prime is 198180859. The reversal of 198180855 is 558081891.

It is not a de Polignac number, because 198180855 - 2³ = 198180847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4404019 = 198180855 / (1 + 9 + 8 + 1 + 8 + 0 + 8 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 198180855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198180859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2201965 + ... + 2202054.

It is an arithmetic number, because the mean of its divisors is an integer number (28626130).

Almost surely, 2^198180855 is an apocalyptic number.

198180855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

198180855 is a deficient number, since it is larger than the sum of its proper divisors (145332705).

198180855 is a wasteful number, since it uses less digits than its factorization.

198180855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4404030 (or 4404027 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 45.

The square root of 198180855 is about 14077.6722152492. The cubic root of 198180855 is about 583.0250737745.

The spelling of 198180855 in words is "one hundred ninety-eight million, one hundred eighty thousand, eight hundred fifty-five".