1209307728 has 20 divisors (see below), whose sum is σ = 3124045088. Its totient is φ = 403102560.

The previous prime is 1209307721. The next prime is 1209307783. The reversal of 1209307728 is 8277039021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209307721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12596908 + ... + 12597003.

Almost surely, 2^1209307728 is an apocalyptic number.

It is an amenable number.

1209307728 is an abundant number, since it is smaller than the sum of its proper divisors (1914737360).

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

1209307728 is a wasteful number, since it uses less digits than its factorization.

1209307728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25193922 (or 25193916 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 1209307728 is about 34775.1021278155. The cubic root of 1209307728 is about 1065.3989785519.

The spelling of 1209307728 in words is "one billion, two hundred nine million, three hundred seven thousand, seven hundred twenty-eight".