2784381869 has 2 divisors, whose sum is σ = 2784381870. Its totient is φ = 2784381868.

The previous prime is 2784381851. The next prime is 2784381893. The reversal of 2784381869 is 9681834872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1742060644 + 1042321225 = 41738^2 + 32285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2784381869 is a prime.

It is a super-2 number, since 2×2784381869² = 15505564784831866322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2784381269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1392190934 + 1392190935.

It is an arithmetic number, because the mean of its divisors is an integer number (1392190935).

Almost surely, 2^2784381869 is an apocalyptic number.

It is an amenable number.

2784381869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2784381869 is an equidigital number, since it uses as much as digits as its factorization.

2784381869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 56.

The square root of 2784381869 is about 52767.2423857832. The cubic root of 2784381869 is about 1406.8342484010.

The spelling of 2784381869 in words is "two billion, seven hundred eighty-four million, three hundred eighty-one thousand, eight hundred sixty-nine".