549438721 has 8 divisors (see below), whose sum is σ = 592099200. Its totient is φ = 506834832.

The previous prime is 549438719. The next prime is 549438731. The reversal of 549438721 is 127834945.

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 549438721 - 2¹ = 549438719 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549438731) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7230 + ... + 33928.

It is an arithmetic number, because the mean of its divisors is an integer number (74012400).

Almost surely, 2^549438721 is an apocalyptic number.

It is an amenable number.

549438721 is a deficient number, since it is larger than the sum of its proper divisors (42660479).

549438721 is a wasteful number, since it uses less digits than its factorization.

549438721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28295.

The product of its digits is 241920, while the sum is 43.

The square root of 549438721 is about 23440.1092360936. The cubic root of 549438721 is about 819.0424679673.

The spelling of 549438721 in words is "five hundred forty-nine million, four hundred thirty-eight thousand, seven hundred twenty-one".