2787409 has 2 divisors, whose sum is σ = 2787410. Its totient is φ = 2787408.

The previous prime is 2787403. The next prime is 2787419. The reversal of 2787409 is 9047872.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2039184 + 748225 = 1428^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 2787409 - 2⁵ = 2787377 is a prime.

It is not a weakly prime, because it can be changed into another prime (2787403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1393704 + 1393705.

It is an arithmetic number, because the mean of its divisors is an integer number (1393705).

2^2787409 is an apocalyptic number.

It is an amenable number.

2787409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2787409 is an equidigital number, since it uses as much as digits as its factorization.

2787409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 2787409 is about 1669.5535331339. The cubic root of 2787409 is about 140.7343892238.

The spelling of 2787409 in words is "two million, seven hundred eighty-seven thousand, four hundred nine".