1684289 has 2 divisors, whose sum is σ = 1684290. Its totient is φ = 1684288.

The previous prime is 1684283. The next prime is 1684297. The reversal of 1684289 is 9824861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1537600 + 146689 = 1240^2 + 383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1684289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1684283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842144 + 842145.

It is an arithmetic number, because the mean of its divisors is an integer number (842145).

2^1684289 is an apocalyptic number.

It is an amenable number.

1684289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684289 is an equidigital number, since it uses as much as digits as its factorization.

1684289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 1684289 is about 1297.8016027113. The cubic root of 1684289 is about 118.9795176950.

The spelling of 1684289 in words is "one million, six hundred eighty-four thousand, two hundred eighty-nine".