289231866 has 144 divisors (see below), whose sum is σ = 802698624. Its totient is φ = 73656000.

The previous prime is 289231799. The next prime is 289231871. The reversal of 289231866 is 668132982.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 929851 + ... + 930161.

It is an arithmetic number, because the mean of its divisors is an integer number (5574296).

Almost surely, 2^289231866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 289231866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401349312).

289231866 is an abundant number, since it is smaller than the sum of its proper divisors (513466758).

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

289231866 is a wasteful number, since it uses less digits than its factorization.

289231866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 395 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 289231866 is about 17006.8182209372. The cubic root of 289231866 is about 661.3256688266.

The spelling of 289231866 in words is "two hundred eighty-nine million, two hundred thirty-one thousand, eight hundred sixty-six".