1680829 has 4 divisors (see below), whose sum is σ = 1705984. Its totient is φ = 1655676.

The previous prime is 1680823. The next prime is 1680839. The reversal of 1680829 is 9280861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9280861 = 17 ⋅545933.

It is a cyclic number.

It is not a de Polignac number, because 1680829 - 2³ = 1680821 is a prime.

It is a super-2 number, since 2×1680829² = 5650372254482, which contains 22 as substring.

It is a Duffinian number.

1680829 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1680794 and 1680803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12477 + ... + 12610.

It is an arithmetic number, because the mean of its divisors is an integer number (426496).

2^1680829 is an apocalyptic number.

It is an amenable number.

1680829 is a deficient number, since it is larger than the sum of its proper divisors (25155).

1680829 is an equidigital number, since it uses as much as digits as its factorization.

1680829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25154.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1680829 is about 1296.4678939334. The cubic root of 1680829 is about 118.8979894561.

The spelling of 1680829 in words is "one million, six hundred eighty thousand, eight hundred twenty-nine".