1728231009 has 16 divisors (see below), whose sum is σ = 2345241600. Its totient is φ = 1131718736.

The previous prime is 1728231007. The next prime is 1728231047. The reversal of 1728231009 is 9001328271.

It is a cyclic number.

It is not a de Polignac number, because 1728231009 - 2¹ = 1728231007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1728231007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272812 + ... + 279074.

It is an arithmetic number, because the mean of its divisors is an integer number (146577600).

Almost surely, 2^1728231009 is an apocalyptic number.

It is an amenable number.

1728231009 is a deficient number, since it is larger than the sum of its proper divisors (617010591).

1728231009 is a wasteful number, since it uses less digits than its factorization.

1728231009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7884.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1728231009 is about 41571.9978952179. The cubic root of 1728231009 is about 1200.0534719228.

The spelling of 1728231009 in words is "one billion, seven hundred twenty-eight million, two hundred thirty-one thousand, nine".