2787689 has 2 divisors, whose sum is σ = 2787690. Its totient is φ = 2787688.

The previous prime is 2787649. The next prime is 2787703. The reversal of 2787689 is 9867872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2418025 + 369664 = 1555^2 + 608^2 .

It is a cyclic number.

It is not a de Polignac number, because 2787689 - 2¹² = 2783593 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2787619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1393844 + 1393845.

It is an arithmetic number, because the mean of its divisors is an integer number (1393845).

2^2787689 is an apocalyptic number.

It is an amenable number.

2787689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2787689 is an equidigital number, since it uses as much as digits as its factorization.

2787689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 2787689 is about 1669.6373857817. The cubic root of 2787689 is about 140.7391014027.

The spelling of 2787689 in words is "two million, seven hundred eighty-seven thousand, six hundred eighty-nine".