198186820 has 24 divisors (see below), whose sum is σ = 448207704. Its totient is φ = 73176576.

The previous prime is 198186817. The next prime is 198186829. The reversal of 198186820 is 28681891.

It can be written as a sum of positive squares in 4 ways, for example, as 8904256 + 189282564 = 2984^2 + 13758^2 .

It is not an unprimeable number, because it can be changed into a prime (198186829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380869 + ... + 381388.

It is an arithmetic number, because the mean of its divisors is an integer number (18675321).

Almost surely, 2^198186820 is an apocalyptic number.

198186820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198186820 is an abundant number, since it is smaller than the sum of its proper divisors (250020884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198186820 is a wasteful number, since it uses less digits than its factorization.

198186820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762279 (or 762277 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 43.

The square root of 198186820 is about 14077.8840739651. The cubic root of 198186820 is about 583.0309231617.

The spelling of 198186820 in words is "one hundred ninety-eight million, one hundred eighty-six thousand, eight hundred twenty".