198929891 has 8 divisors (see below), whose sum is σ = 203137104. Its totient is φ = 194762880.

The previous prime is 198929837. The next prime is 198929893.

198929891 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198929891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198929893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56 + ... + 19946.

It is an arithmetic number, because the mean of its divisors is an integer number (25392138).

Almost surely, 2^198929891 is an apocalyptic number.

198929891 is a deficient number, since it is larger than the sum of its proper divisors (4207213).

198929891 is a wasteful number, since it uses less digits than its factorization.

198929891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20101.

The product of its digits is 839808, while the sum is 56.

The square root of 198929891 is about 14104.2508131414. The cubic root of 198929891 is about 583.7586759773.

The spelling of 198929891 in words is "one hundred ninety-eight million, nine hundred twenty-nine thousand, eight hundred ninety-one".