8404997857 has 2 divisors, whose sum is σ = 8404997858. Its totient is φ = 8404997856.

The previous prime is 8404997851. The next prime is 8404997873. The reversal of 8404997857 is 7587994048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5968489536 + 2436508321 = 77256^2 + 49361^2 .

It is a cyclic number.

It is not a de Polignac number, because 8404997857 - 2³ = 8404997849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8404997795 and 8404997804.

It is not a weakly prime, because it can be changed into another prime (8404997851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4202498928 + 4202498929.

It is an arithmetic number, because the mean of its divisors is an integer number (4202498929).

Almost surely, 2^8404997857 is an apocalyptic number.

It is an amenable number.

8404997857 is a deficient number, since it is larger than the sum of its proper divisors (1).

8404997857 is an equidigital number, since it uses as much as digits as its factorization.

8404997857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20321280, while the sum is 61.

The square root of 8404997857 is about 91678.7753899451. The cubic root of 8404997857 is about 2033.1957927181.

The spelling of 8404997857 in words is "eight billion, four hundred four million, nine hundred ninety-seven thousand, eight hundred fifty-seven".