1680117 has 4 divisors (see below), whose sum is σ = 2240160. Its totient is φ = 1120076.

The previous prime is 1680103. The next prime is 1680121. The reversal of 1680117 is 7110861.

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: 7110861 = 3 ⋅2370287.

It is a cyclic number.

It is not a de Polignac number, because 1680117 - 2⁴ = 1680101 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280017 + ... + 280022.

It is an arithmetic number, because the mean of its divisors is an integer number (560040).

2^1680117 is an apocalyptic number.

It is an amenable number.

1680117 is a deficient number, since it is larger than the sum of its proper divisors (560043).

1680117 is an equidigital number, since it uses as much as digits as its factorization.

1680117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560042.

The product of its (nonzero) digits is 336, while the sum is 24.

The square root of 1680117 is about 1296.1932726257. The cubic root of 1680117 is about 118.8811986693.

Adding to 1680117 its reverse (7110861), we get a palindrome (8790978).

The spelling of 1680117 in words is "one million, six hundred eighty thousand, one hundred seventeen".