999847957 has 2 divisors, whose sum is σ = 999847958. Its totient is φ = 999847956.

The previous prime is 999847951. The next prime is 999847999. The reversal of 999847957 is 759748999.

999847957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629708836 + 370139121 = 25094^2 + 19239^2 .

It is a cyclic number.

It is not a de Polignac number, because 999847957 - 2⁷ = 999847829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999847892 and 999847901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999847951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499923978 + 499923979.

It is an arithmetic number, because the mean of its divisors is an integer number (499923979).

Almost surely, 2^999847957 is an apocalyptic number.

It is an amenable number.

999847957 is a deficient number, since it is larger than the sum of its proper divisors (1).

999847957 is an equidigital number, since it uses as much as digits as its factorization.

999847957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51438240, while the sum is 67.

The square root of 999847957 is about 31620.3724993872. The cubic root of 999847957 is about 999.9493164312.

The spelling of 999847957 in words is "nine hundred ninety-nine million, eight hundred forty-seven thousand, nine hundred fifty-seven".