845640043 has 2 divisors, whose sum is σ = 845640044. Its totient is φ = 845640042.

The previous prime is 845640017. The next prime is 845640067. The reversal of 845640043 is 340046548.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845640043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 845639990 and 845640008.

It is not a weakly prime, because it can be changed into another prime (845640013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422820021 + 422820022.

It is an arithmetic number, because the mean of its divisors is an integer number (422820022).

Almost surely, 2^845640043 is an apocalyptic number.

845640043 is a deficient number, since it is larger than the sum of its proper divisors (1).

845640043 is an equidigital number, since it uses as much as digits as its factorization.

845640043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 845640043 is about 29079.8906978689. The cubic root of 845640043 is about 945.6458330771.

The spelling of 845640043 in words is "eight hundred forty-five million, six hundred forty thousand, forty-three".