289721646 has 12 divisors (see below), whose sum is σ = 627730272. Its totient is φ = 96573876.

The previous prime is 289721609. The next prime is 289721693. The reversal of 289721646 is 646127982.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8047806 + ... + 8047841.

It is an arithmetic number, because the mean of its divisors is an integer number (52310856).

Almost surely, 2^289721646 is an apocalyptic number.

289721646 is an abundant number, since it is smaller than the sum of its proper divisors (338008626).

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

289721646 is a wasteful number, since it uses less digits than its factorization.

289721646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16095655 (or 16095652 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 289721646 is about 17021.2116489984. The cubic root of 289721646 is about 661.6987506165.

The spelling of 289721646 in words is "two hundred eighty-nine million, seven hundred twenty-one thousand, six hundred forty-six".