8428139 has 2 divisors, whose sum is σ = 8428140. Its totient is φ = 8428138.

The previous prime is 8428099. The next prime is 8428157. The reversal of 8428139 is 9318248.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8428139 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8428099 and 8428108.

It is not a weakly prime, because it can be changed into another prime (8428159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4214069 + 4214070.

It is an arithmetic number, because the mean of its divisors is an integer number (4214070).

Almost surely, 2^8428139 is an apocalyptic number.

8428139 is a deficient number, since it is larger than the sum of its proper divisors (1).

8428139 is an equidigital number, since it uses as much as digits as its factorization.

8428139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 8428139 is about 2903.1257292787. The cubic root of 8428139 is about 203.5060054934.

The spelling of 8428139 in words is "eight million, four hundred twenty-eight thousand, one hundred thirty-nine".