1720622 has 4 divisors (see below), whose sum is σ = 2580936. Its totient is φ = 860310.

The previous prime is 1720619. The next prime is 1720633. The reversal of 1720622 is 2260271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2260271 = 13 ⋅173867.

It is a junction number, because it is equal to n+sod(n) for n = 1720594 and 1720603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430154 + ... + 430157.

It is an arithmetic number, because the mean of its divisors is an integer number (645234).

2^1720622 is an apocalyptic number.

1720622 is a deficient number, since it is larger than the sum of its proper divisors (860314).

1720622 is an equidigital number, since it uses as much as digits as its factorization.

1720622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860313.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1720622 is about 1311.7248187025. The cubic root of 1720622 is about 119.8289693163.

Adding to 1720622 its reverse (2260271), we get a palindrome (3980893).

The spelling of 1720622 in words is "one million, seven hundred twenty thousand, six hundred twenty-two".