42847789 has 2 divisors, whose sum is σ = 42847790. Its totient is φ = 42847788.

The previous prime is 42847787. The next prime is 42847817. The reversal of 42847789 is 98774824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40068900 + 2778889 = 6330^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 42847789 - 2¹ = 42847787 is a prime.

Together with 42847787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42847787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21423894 + 21423895.

It is an arithmetic number, because the mean of its divisors is an integer number (21423895).

Almost surely, 2^42847789 is an apocalyptic number.

It is an amenable number.

42847789 is a deficient number, since it is larger than the sum of its proper divisors (1).

42847789 is an equidigital number, since it uses as much as digits as its factorization.

42847789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 49.

The square root of 42847789 is about 6545.8222554542. The cubic root of 42847789 is about 349.9259407929.

The spelling of 42847789 in words is "forty-two million, eight hundred forty-seven thousand, seven hundred eighty-nine".