207989 has 4 divisors (see below), whose sum is σ = 217056. Its totient is φ = 198924.

The previous prime is 207973. The next prime is 207997. The reversal of 207989 is 989702.

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.

It is a cyclic number.

It is not a de Polignac number, because 207989 - 2⁴ = 207973 is a prime.

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 (207589) 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, 4499 + ... + 4544.

It is an arithmetic number, because the mean of its divisors is an integer number (54264).

2²⁰⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

207989 is a deficient number, since it is larger than the sum of its proper divisors (9067).

207989 is an equidigital number, since it uses as much as digits as its factorization.

207989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9066.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 207989 is about 456.0581103324. The cubic root of 207989 is about 59.2488768800.

The spelling of 207989 in words is "two hundred seven thousand, nine hundred eighty-nine".