289310985 has 24 divisors (see below), whose sum is σ = 501958080. Its totient is φ = 154149792.

The previous prime is 289310969. The next prime is 289310993. The reversal of 289310985 is 589013982.

It is a happy number.

It is not a de Polignac number, because 289310985 - 2⁴ = 289310969 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 289310985.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56356 + ... + 61274.

It is an arithmetic number, because the mean of its divisors is an integer number (20914920).

Almost surely, 2^289310985 is an apocalyptic number.

It is an amenable number.

289310985 is a deficient number, since it is larger than the sum of its proper divisors (212647095).

289310985 is a wasteful number, since it uses less digits than its factorization.

289310985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6237 (or 6234 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 289310985 is about 17009.1441583638. The cubic root of 289310985 is about 661.3859649205.

The spelling of 289310985 in words is "two hundred eighty-nine million, three hundred ten thousand, nine hundred eighty-five".