1720630 has 16 divisors (see below), whose sum is σ = 3232224. Its totient is φ = 658240.

The previous prime is 1720619. The next prime is 1720633. The reversal of 1720630 is 360271.

It is a junction number, because it is equal to n+sod(n) for n = 1720598 and 1720607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3511 + ... + 3970.

It is an arithmetic number, because the mean of its divisors is an integer number (202014).

2^1720630 is an apocalyptic number.

1720630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1720630 is a deficient number, since it is larger than the sum of its proper divisors (1511594).

1720630 is a wasteful number, since it uses less digits than its factorization.

1720630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7511.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 1720630 is about 1311.7278681190. The cubic root of 1720630 is about 119.8291550302.

The spelling of 1720630 in words is "one million, seven hundred twenty thousand, six hundred thirty".