198312989 has 8 divisors (see below), whose sum is σ = 229512960. Its totient is φ = 167830416.

The previous prime is 198312977. The next prime is 198313043. The reversal of 198312989 is 989213891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 198312989 - 2¹⁶ = 198247453 is a prime.

It is a super-2 number, since 2×198312989² = 78656083212228242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198312889) 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, 178754 + ... + 179859.

It is an arithmetic number, because the mean of its divisors is an integer number (28689120).

Almost surely, 2^198312989 is an apocalyptic number.

It is an amenable number.

198312989 is a deficient number, since it is larger than the sum of its proper divisors (31199971).

198312989 is an equidigital number, since it uses as much as digits as its factorization.

198312989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358699.

The product of its digits is 279936, while the sum is 50.

The square root of 198312989 is about 14082.3644676595. The cubic root of 198312989 is about 583.1546192853.

The spelling of 198312989 in words is "one hundred ninety-eight million, three hundred twelve thousand, nine hundred eighty-nine".