1720830 has 32 divisors (see below), whose sum is σ = 4348800. Its totient is φ = 434592.

The previous prime is 1720799. The next prime is 1720843. The reversal of 1720830 is 380271.

It is a super-2 number, since 2×1720830² = 5922511777800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1720797 and 1720806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 940 + ... + 2079.

It is an arithmetic number, because the mean of its divisors is an integer number (135900).

2^1720830 is an apocalyptic number.

1720830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1720830 is an abundant number, since it is smaller than the sum of its proper divisors (2627970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1720830 is a wasteful number, since it uses less digits than its factorization.

1720830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3048.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1720830 is about 1311.8041012285. The cubic root of 1720830 is about 119.8337976907.

The spelling of 1720830 in words is "one million, seven hundred twenty thousand, eight hundred thirty".