1728543841 has 4 divisors (see below), whose sum is σ = 1729796884. Its totient is φ = 1727290800.

The previous prime is 1728543809. The next prime is 1728543847. The reversal of 1728543841 is 1483458271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 985708816 + 742835025 = 31396^2 + 27255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728543841 - 2⁵ = 1728543809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1728543847) 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, 624450 + ... + 627211.

It is an arithmetic number, because the mean of its divisors is an integer number (432449221).

Almost surely, 2^1728543841 is an apocalyptic number.

It is an amenable number.

1728543841 is a deficient number, since it is larger than the sum of its proper divisors (1253043).

1728543841 is a wasteful number, since it uses less digits than its factorization.

1728543841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253042.

The product of its digits is 215040, while the sum is 43.

The square root of 1728543841 is about 41575.7602576309. The cubic root of 1728543841 is about 1200.1258759160.

The spelling of 1728543841 in words is "one billion, seven hundred twenty-eight million, five hundred forty-three thousand, eight hundred forty-one".