289394009 has 4 divisors (see below), whose sum is σ = 306417204. Its totient is φ = 272370816.

The previous prime is 289394003. The next prime is 289394023. The reversal of 289394009 is 900493982.

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 181171600 + 108222409 = 13460^2 + 10403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289394009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (289394003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8511572 + ... + 8511605.

It is an arithmetic number, because the mean of its divisors is an integer number (76604301).

Almost surely, 2^289394009 is an apocalyptic number.

It is an amenable number.

289394009 is a deficient number, since it is larger than the sum of its proper divisors (17023195).

289394009 is a wasteful number, since it uses less digits than its factorization.

289394009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17023194.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 289394009 is about 17011.5845528863. The cubic root of 289394009 is about 661.4492251715.

The spelling of 289394009 in words is "two hundred eighty-nine million, three hundred ninety-four thousand, nine".