198088689 has 4 divisors (see below), whose sum is σ = 264118256. Its totient is φ = 132059124.

The previous prime is 198088679. The next prime is 198088703. The reversal of 198088689 is 986880891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 986880891 = 3 ⋅328960297.

It is not a de Polignac number, because 198088689 - 2¹⁹ = 197564401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198088609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33014779 + ... + 33014784.

It is an arithmetic number, because the mean of its divisors is an integer number (66029564).

Almost surely, 2^198088689 is an apocalyptic number.

It is an amenable number.

198088689 is a deficient number, since it is larger than the sum of its proper divisors (66029567).

198088689 is an equidigital number, since it uses as much as digits as its factorization.

198088689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66029566.

The product of its (nonzero) digits is 1990656, while the sum is 57.

The square root of 198088689 is about 14074.3983530380. The cubic root of 198088689 is about 582.9346792018.

The spelling of 198088689 in words is "one hundred ninety-eight million, eighty-eight thousand, six hundred eighty-nine".