1728969361 has 8 divisors (see below), whose sum is σ = 2016291200. Its totient is φ = 1481973444.

The previous prime is 1728969349. The next prime is 1728969373. The reversal of 1728969361 is 1639698271.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1728969349) and next prime (1728969373).

It is not a de Polignac number, because 1728969361 - 2⁹ = 1728968849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1728969299 and 1728969308.

It is not an unprimeable number, because it can be changed into a prime (1728969301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2520021 + ... + 2520706.

It is an arithmetic number, because the mean of its divisors is an integer number (252036400).

Almost surely, 2^1728969361 is an apocalyptic number.

It is an amenable number.

1728969361 is a deficient number, since it is larger than the sum of its proper divisors (287321839).

1728969361 is an frugal number, since it uses more digits than its factorization.

1728969361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5040748 (or 5040734 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 1728969361 is about 41580.8773476462. The cubic root of 1728969361 is about 1200.2243471747.

The spelling of 1728969361 in words is "one billion, seven hundred twenty-eight million, nine hundred sixty-nine thousand, three hundred sixty-one".