2857009 has 2 divisors, whose sum is σ = 2857010. Its totient is φ = 2857008.

The previous prime is 2856977. The next prime is 2857013. The reversal of 2857009 is 9007582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2712609 + 144400 = 1647^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 2857009 - 2⁵ = 2856977 is a prime.

It is not a weakly prime, because it can be changed into another prime (2857039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428504 + 1428505.

It is an arithmetic number, because the mean of its divisors is an integer number (1428505).

2^2857009 is an apocalyptic number.

It is an amenable number.

2857009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2857009 is an equidigital number, since it uses as much as digits as its factorization.

2857009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 2857009 is about 1690.2689135164. The cubic root of 2857009 is about 141.8961251833.

The spelling of 2857009 in words is "two million, eight hundred fifty-seven thousand, nine".