289961856 has 80 divisors (see below), whose sum is σ = 862952640. Its totient is φ = 96650496.

The previous prime is 289961821. The next prime is 289961891. The reversal of 289961856 is 658169982.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (289961821) and next prime (289961891).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3616 + ... + 24351.

It is an arithmetic number, because the mean of its divisors is an integer number (10786908).

Almost surely, 2^289961856 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 289961856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (431476320).

289961856 is an abundant number, since it is smaller than the sum of its proper divisors (572990784).

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

289961856 is an equidigital number, since it uses as much as digits as its factorization.

289961856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27993 (or 27972 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 289961856 is about 17028.2663826944. The cubic root of 289961856 is about 661.8815729351.

The spelling of 289961856 in words is "two hundred eighty-nine million, nine hundred sixty-one thousand, eight hundred fifty-six".