289340856 has 128 divisors (see below), whose sum is σ = 948326400. Its totient is φ = 79989120.

The previous prime is 289340819. The next prime is 289340881. The reversal of 289340856 is 658043982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43786 + ... + 49958.

It is an arithmetic number, because the mean of its divisors is an integer number (7408800).

Almost surely, 2^289340856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 289340856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474163200).

289340856 is an abundant number, since it is smaller than the sum of its proper divisors (658985544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

289340856 is a wasteful number, since it uses less digits than its factorization.

289340856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6226 (or 6216 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 289340856 is about 17010.0222222077. The cubic root of 289340856 is about 661.4087265638.

The spelling of 289340856 in words is "two hundred eighty-nine million, three hundred forty thousand, eight hundred fifty-six".