489105721 has 8 divisors (see below), whose sum is σ = 526982400. Its totient is φ = 451265232.

The previous prime is 489105713. The next prime is 489105737. The reversal of 489105721 is 127501984.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 489105721 - 2³ = 489105713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (489105821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23346 + ... + 39028.

It is an arithmetic number, because the mean of its divisors is an integer number (65872800).

Almost surely, 2^489105721 is an apocalyptic number.

It is an amenable number.

489105721 is a deficient number, since it is larger than the sum of its proper divisors (37876679).

489105721 is a wasteful number, since it uses less digits than its factorization.

489105721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18095.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 489105721 is about 22115.7346927476. The cubic root of 489105721 is about 787.8936148004.

The spelling of 489105721 in words is "four hundred eighty-nine million, one hundred five thousand, seven hundred twenty-one".