207197989 has 4 divisors (see below), whose sum is σ = 219386124. Its totient is φ = 195009856.

The previous prime is 207197981. The next prime is 207198067. The reversal of 207197989 is 989791702.

207197989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989791702 = 2 ⋅494895851.

It can be written as a sum of positive squares in 2 ways, for example, as 186540964 + 20657025 = 13658^2 + 4545^2 .

It is not a de Polignac number, because 207197989 - 2³ = 207197981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207197981) 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, 6094042 + ... + 6094075.

It is an arithmetic number, because the mean of its divisors is an integer number (54846531).

Almost surely, 2^207197989 is an apocalyptic number.

It is an amenable number.

207197989 is a deficient number, since it is larger than the sum of its proper divisors (12188135).

207197989 is a wasteful number, since it uses less digits than its factorization.

207197989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12188134.

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 207197989 is about 14394.3735188441. The cubic root of 207197989 is about 591.7367089554.

The spelling of 207197989 in words is "two hundred seven million, one hundred ninety-seven thousand, nine hundred eighty-nine".