1720016 has 20 divisors (see below), whose sum is σ = 3355812. Its totient is φ = 854016.

The previous prime is 1720003. The next prime is 1720031. The reversal of 1720016 is 6100271.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 270400 + 1449616 = 520^2 + 1204^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1719976 and 1720003.

It is a congruent number.

It is an unprimeable number.

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, 2810 + ... + 3366.

2^1720016 is an apocalyptic number.

1720016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1720016 is a deficient number, since it is larger than the sum of its proper divisors (1635796).

1720016 is a wasteful number, since it uses less digits than its factorization.

1720016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 1720016 is about 1311.4938047890. The cubic root of 1720016 is about 119.8148998147.

Adding to 1720016 its reverse (6100271), we get a palindrome (7820287).

The spelling of 1720016 in words is "one million, seven hundred twenty thousand, sixteen".