8428157 has 2 divisors, whose sum is σ = 8428158. Its totient is φ = 8428156.

The previous prime is 8428139. The next prime is 8428159. The reversal of 8428157 is 7518248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7778521 + 649636 = 2789^2 + 806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8428157 is a prime.

Together with 8428159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8428159) 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, 4214078 + 4214079.

It is an arithmetic number, because the mean of its divisors is an integer number (4214079).

Almost surely, 2^8428157 is an apocalyptic number.

It is an amenable number.

8428157 is a deficient number, since it is larger than the sum of its proper divisors (1).

8428157 is an equidigital number, since it uses as much as digits as its factorization.

8428157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17920, while the sum is 35.

The square root of 8428157 is about 2903.1288293839. The cubic root of 8428157 is about 203.5061503694.

Subtracting from 8428157 its reverse (7518248), we obtain a palindrome (909909).

The spelling of 8428157 in words is "eight million, four hundred twenty-eight thousand, one hundred fifty-seven".