198620729 has 4 divisors (see below), whose sum is σ = 198725520. Its totient is φ = 198515940.

The previous prime is 198620717. The next prime is 198620777. The reversal of 198620729 is 927026891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198620729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198620729.

It is not an unprimeable number, because it can be changed into a prime (198620029) 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 3 ways as a sum of consecutive naturals, for example, 49499 + ... + 53360.

It is an arithmetic number, because the mean of its divisors is an integer number (49681380).

Almost surely, 2^198620729 is an apocalyptic number.

It is an amenable number.

198620729 is a deficient number, since it is larger than the sum of its proper divisors (104791).

198620729 is a wasteful number, since it uses less digits than its factorization.

198620729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104790.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 198620729 is about 14093.2866642242. The cubic root of 198620729 is about 583.4561077814.

The spelling of 198620729 in words is "one hundred ninety-eight million, six hundred twenty thousand, seven hundred twenty-nine".