1720573429 has 4 divisors (see below), whose sum is σ = 1724780620. Its totient is φ = 1716366240.

The previous prime is 1720573423. The next prime is 1720573433. The reversal of 1720573429 is 9243750271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9243750271 = 7 ⋅1320535753.

It can be written as a sum of positive squares in 2 ways, for example, as 1290964900 + 429608529 = 35930^2 + 20727^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720573429 - 2⁷ = 1720573301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1720573391 and 1720573400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720573423) 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, 2102982 + ... + 2103799.

It is an arithmetic number, because the mean of its divisors is an integer number (431195155).

Almost surely, 2^1720573429 is an apocalyptic number.

It is an amenable number.

1720573429 is a deficient number, since it is larger than the sum of its proper divisors (4207191).

1720573429 is an equidigital number, since it uses as much as digits as its factorization.

1720573429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207190.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 1720573429 is about 41479.7954310288. The cubic root of 1720573429 is about 1198.2784176522.

The spelling of 1720573429 in words is "one billion, seven hundred twenty million, five hundred seventy-three thousand, four hundred twenty-nine".