198129555 has 24 divisors (see below), whose sum is σ = 369842928. Its totient is φ = 97540416.

The previous prime is 198129553. The next prime is 198129557. The reversal of 198129555 is 555921891.

198129555 is a `hidden beast` number, since 1 + 98 + 1 + 2 + 9 + 555 = 666.

It is an interprime number because it is at equal distance from previous prime (198129553) and next prime (198129557).

It is not a de Polignac number, because 198129555 - 2¹ = 198129553 is a prime.

It is a super-3 number, since 3×198129555³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 198129555.

It is not an unprimeable number, because it can be changed into a prime (198129553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168757 + ... + 169926.

It is an arithmetic number, because the mean of its divisors is an integer number (15410122).

Almost surely, 2^198129555 is an apocalyptic number.

198129555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

198129555 is a deficient number, since it is larger than the sum of its proper divisors (171713373).

198129555 is a wasteful number, since it uses less digits than its factorization.

198129555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338707 (or 338704 counting only the distinct ones).

The product of its digits is 162000, while the sum is 45.

The square root of 198129555 is about 14075.8500631401. The cubic root of 198129555 is about 582.9747632179.

The spelling of 198129555 in words is "one hundred ninety-eight million, one hundred twenty-nine thousand, five hundred fifty-five".