1720725793 has 4 divisors (see below), whose sum is σ = 1721356308. Its totient is φ = 1720095280.

The previous prime is 1720725763. The next prime is 1720725821. The reversal of 1720725793 is 3975270271.

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 244859904 + 1475865889 = 15648^2 + 38417^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720725793 - 2¹³ = 1720717601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720725763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311146 + ... + 316627.

It is an arithmetic number, because the mean of its divisors is an integer number (430339077).

Almost surely, 2^1720725793 is an apocalyptic number.

It is an amenable number.

1720725793 is a deficient number, since it is larger than the sum of its proper divisors (630515).

1720725793 is an equidigital number, since it uses as much as digits as its factorization.

1720725793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630514.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 1720725793 is about 41481.6319953784. The cubic root of 1720725793 is about 1198.3137874696.

The spelling of 1720725793 in words is "one billion, seven hundred twenty million, seven hundred twenty-five thousand, seven hundred ninety-three".