289472309 has 4 divisors (see below), whose sum is σ = 330825504. Its totient is φ = 248119116.

The previous prime is 289472303. The next prime is 289472321. The reversal of 289472309 is 903274982.

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 de Polignac number, because none of the positive numbers 2^k-289472309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 289472309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289472303) 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, 20676587 + ... + 20676600.

It is an arithmetic number, because the mean of its divisors is an integer number (82706376).

Almost surely, 2^289472309 is an apocalyptic number.

It is an amenable number.

289472309 is a deficient number, since it is larger than the sum of its proper divisors (41353195).

289472309 is an equidigital number, since it uses as much as digits as its factorization.

289472309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41353194.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 289472309 is about 17013.8857701584. The cubic root of 289472309 is about 661.5088748791.

The spelling of 289472309 in words is "two hundred eighty-nine million, four hundred seventy-two thousand, three hundred nine".