198706989 has 24 divisors (see below), whose sum is σ = 287968800. Its totient is φ = 121822272.

The previous prime is 198706987. The next prime is 198707011. The reversal of 198706989 is 989607891.

198706989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198706989 - 2¹ = 198706987 is a prime.

It is a super-2 number, since 2×198706989² = 78968934954892242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198706987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176382 + ... + 177504.

It is an arithmetic number, because the mean of its divisors is an integer number (11998700).

Almost surely, 2^198706989 is an apocalyptic number.

It is an amenable number.

198706989 is a deficient number, since it is larger than the sum of its proper divisors (89261811).

198706989 is a wasteful number, since it uses less digits than its factorization.

With its successor (198706990) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1488).

198706989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501 (or 1488 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 57.

The square root of 198706989 is about 14096.3466543640. The cubic root of 198706989 is about 583.5405595906.

The spelling of 198706989 in words is "one hundred ninety-eight million, seven hundred six thousand, nine hundred eighty-nine".