7938857 has 2 divisors, whose sum is σ = 7938858. Its totient is φ = 7938856.

The previous prime is 7938851. The next prime is 7938859. The reversal of 7938857 is 7588397.

7938857 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4713241 + 3225616 = 2171^2 + 1796^2 .

It is a cyclic number.

It is not a de Polignac number, because 7938857 - 2¹⁶ = 7873321 is a prime.

Together with 7938859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7938851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969428 + 3969429.

It is an arithmetic number, because the mean of its divisors is an integer number (3969429).

Almost surely, 2^7938857 is an apocalyptic number.

It is an amenable number.

7938857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7938857 is an equidigital number, since it uses as much as digits as its factorization.

7938857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 47.

The square root of 7938857 is about 2817.5977356606. The cubic root of 7938857 is about 199.4891713814.

The spelling of 7938857 in words is "seven million, nine hundred thirty-eight thousand, eight hundred fifty-seven".