1684861 has 2 divisors, whose sum is σ = 1684862. Its totient is φ = 1684860.

The previous prime is 1684843. The next prime is 1684867.

1684861 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 962361 + 722500 = 981^2 + 850^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1684861 - 2⁵ = 1684829 is a prime.

1684861 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1684867) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842430 + 842431.

It is an arithmetic number, because the mean of its divisors is an integer number (842431).

2^1684861 is an apocalyptic number.

It is an amenable number.

1684861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684861 is an equidigital number, since it uses as much as digits as its factorization.

1684861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 34.

The square root of 1684861 is about 1298.0219566710. The cubic root of 1684861 is about 118.9929850159.

The spelling of 1684861 in words is "one million, six hundred eighty-four thousand, eight hundred sixty-one".