2782009 has 2 divisors, whose sum is σ = 2782010. Its totient is φ = 2782008.

The previous prime is 2782001. The next prime is 2782019. The reversal of 2782009 is 9002872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2624400 + 157609 = 1620^2 + 397^2 .

It is a cyclic number.

It is not a de Polignac number, because 2782009 - 2³ = 2782001 is a prime.

2782009 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2782001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1391004 + 1391005.

It is an arithmetic number, because the mean of its divisors is an integer number (1391005).

2^2782009 is an apocalyptic number.

It is an amenable number.

2782009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2782009 is an equidigital number, since it uses as much as digits as its factorization.

2782009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 2782009 is about 1667.9355503136. The cubic root of 2782009 is about 140.6434496946.

The spelling of 2782009 in words is "two million, seven hundred eighty-two thousand, nine".