843978041 has 2 divisors, whose sum is σ = 843978042. Its totient is φ = 843978040.

The previous prime is 843978001. The next prime is 843978059. The reversal of 843978041 is 140879348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 834343225 + 9634816 = 28885^2 + 3104^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-843978041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 843977983 and 843978001.

It is not a weakly prime, because it can be changed into another prime (843978001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421989020 + 421989021.

It is an arithmetic number, because the mean of its divisors is an integer number (421989021).

Almost surely, 2^843978041 is an apocalyptic number.

It is an amenable number.

843978041 is a deficient number, since it is larger than the sum of its proper divisors (1).

843978041 is an equidigital number, since it uses as much as digits as its factorization.

843978041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 843978041 is about 29051.3001602338. The cubic root of 843978041 is about 945.0259097251.

The spelling of 843978041 in words is "eight hundred forty-three million, nine hundred seventy-eight thousand, forty-one".