1720459669 has 4 divisors (see below), whose sum is σ = 1775958400. Its totient is φ = 1664960940.

The previous prime is 1720459649. The next prime is 1720459679. The reversal of 1720459669 is 9669540271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1720459669 - 2²³ = 1712071061 is a prime.

It is a super-2 number, since 2×1720459669² = 5919962945311179122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720459649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27749319 + ... + 27749380.

It is an arithmetic number, because the mean of its divisors is an integer number (443989600).

Almost surely, 2^1720459669 is an apocalyptic number.

It is an amenable number.

1720459669 is a deficient number, since it is larger than the sum of its proper divisors (55498731).

1720459669 is an equidigital number, since it uses as much as digits as its factorization.

1720459669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55498730.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 1720459669 is about 41478.4241383397. The cubic root of 1720459669 is about 1198.2520080156.

The spelling of 1720459669 in words is "one billion, seven hundred twenty million, four hundred fifty-nine thousand, six hundred sixty-nine".