198129812 has 6 divisors (see below), whose sum is σ = 346727178. Its totient is φ = 99064904.

The previous prime is 198129809. The next prime is 198129817. The reversal of 198129812 is 218921891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 185068816 + 13060996 = 13604^2 + 3614^2 .

It is a super-3 number, since 3×198129812³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 198129812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198129817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24766223 + ... + 24766230.

It is an arithmetic number, because the mean of its divisors is an integer number (57787863).

Almost surely, 2^198129812 is an apocalyptic number.

It is an amenable number.

198129812 is a deficient number, since it is larger than the sum of its proper divisors (148597366).

198129812 is a wasteful number, since it uses less digits than its factorization.

198129812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49532457 (or 49532455 counting only the distinct ones).

The product of its digits is 20736, while the sum is 41.

The square root of 198129812 is about 14075.8591922483. The cubic root of 198129812 is about 582.9750152827.

The spelling of 198129812 in words is "one hundred ninety-eight million, one hundred twenty-nine thousand, eight hundred twelve".