1720616 has 8 divisors (see below), whose sum is σ = 3226170. Its totient is φ = 860304.

The previous prime is 1720613. The next prime is 1720619. The reversal of 1720616 is 6160271.

It is an interprime number because it is at equal distance from previous prime (1720613) and next prime (1720619).

It can be written as a sum of positive squares in only one way, i.e., 1552516 + 168100 = 1246^2 + 410^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1720591 and 1720600.

It is not an unprimeable number, because it can be changed into a prime (1720613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107531 + ... + 107546.

2^1720616 is an apocalyptic number.

It is an amenable number.

1720616 is a deficient number, since it is larger than the sum of its proper divisors (1505554).

1720616 is a wasteful number, since it uses less digits than its factorization.

1720616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215083 (or 215079 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1720616 is about 1311.7225316354. The cubic root of 1720616 is about 119.8288300305.

Adding to 1720616 its reverse (6160271), we get a palindrome (7880887).

The spelling of 1720616 in words is "one million, seven hundred twenty thousand, six hundred sixteen".