1720069 has 4 divisors (see below), whose sum is σ = 1852396. Its totient is φ = 1587744.

The previous prime is 1720063. The next prime is 1720109. The reversal of 1720069 is 9600271.

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 315844 + 1404225 = 562^2 + 1185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720069 is a prime.

It is a super-2 number, since 2×1720069² = 5917274729522, which contains 22 as substring.

1720069 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720063) 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, 66144 + ... + 66169.

It is an arithmetic number, because the mean of its divisors is an integer number (463099).

2^1720069 is an apocalyptic number.

It is an amenable number.

1720069 is a deficient number, since it is larger than the sum of its proper divisors (132327).

1720069 is a wasteful number, since it uses less digits than its factorization.

1720069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132326.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 1720069 is about 1311.5140106000. The cubic root of 1720069 is about 119.8161304475.

The spelling of 1720069 in words is "one million, seven hundred twenty thousand, sixty-nine".