847704749 has 2 divisors, whose sum is σ = 847704750. Its totient is φ = 847704748.

The previous prime is 847704719. The next prime is 847704751. The reversal of 847704749 is 947407748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 745836100 + 101868649 = 27310^2 + 10093^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-847704749 is a prime.

Together with 847704751, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 847704697 and 847704706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (847704719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423852374 + 423852375.

It is an arithmetic number, because the mean of its divisors is an integer number (423852375).

Almost surely, 2^847704749 is an apocalyptic number.

It is an amenable number.

847704749 is a deficient number, since it is larger than the sum of its proper divisors (1).

847704749 is an equidigital number, since it uses as much as digits as its factorization.

847704749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The square root of 847704749 is about 29115.3696352974. The cubic root of 847704749 is about 946.4148339230.

The spelling of 847704749 in words is "eight hundred forty-seven million, seven hundred four thousand, seven hundred forty-nine".