2805689 has 2 divisors, whose sum is σ = 2805690. Its totient is φ = 2805688.

The previous prime is 2805683. The next prime is 2805703. The reversal of 2805689 is 9865082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2805625 + 64 = 1675^2 + 8^2 .

It is a cyclic number.

It is not a de Polignac number, because 2805689 - 2¹² = 2801593 is a prime.

It is a super-3 number, since 3×2805689³ = 66258231983337893307, which contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2805683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1402844 + 1402845.

It is an arithmetic number, because the mean of its divisors is an integer number (1402845).

2^2805689 is an apocalyptic number.

It is an amenable number.

2805689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2805689 is an equidigital number, since it uses as much as digits as its factorization.

2805689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 2805689 is about 1675.0191043687. The cubic root of 2805689 is about 141.0413674038.

The spelling of 2805689 in words is "two million, eight hundred five thousand, six hundred eighty-nine".