289203989 has 4 divisors (see below), whose sum is σ = 293945100. Its totient is φ = 284462880.

The previous prime is 289203977. The next prime is 289204009. The reversal of 289203989 is 989302982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139948900 + 149255089 = 11830^2 + 12217^2 .

It is a cyclic number.

It is not a de Polignac number, because 289203989 - 2⁴ = 289203973 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 (289283989) 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, 2370464 + ... + 2370585.

It is an arithmetic number, because the mean of its divisors is an integer number (73486275).

Almost surely, 2^289203989 is an apocalyptic number.

It is an amenable number.

289203989 is a deficient number, since it is larger than the sum of its proper divisors (4741111).

289203989 is an equidigital number, since it uses as much as digits as its factorization.

289203989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4741110.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 289203989 is about 17005.9986181347. The cubic root of 289203989 is about 661.3044213199.

The spelling of 289203989 in words is "two hundred eighty-nine million, two hundred three thousand, nine hundred eighty-nine".