7870139 has 2 divisors, whose sum is σ = 7870140. Its totient is φ = 7870138.

The previous prime is 7870097. The next prime is 7870141. The reversal of 7870139 is 9310787.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7870139 is a prime.

Together with 7870141, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7870099 and 7870108.

It is not a weakly prime, because it can be changed into another prime (7870739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3935069 + 3935070.

It is an arithmetic number, because the mean of its divisors is an integer number (3935070).

Almost surely, 2^7870139 is an apocalyptic number.

7870139 is a deficient number, since it is larger than the sum of its proper divisors (1).

7870139 is an equidigital number, since it uses as much as digits as its factorization.

7870139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 7870139 is about 2805.3768017862. The cubic root of 7870139 is about 198.9119161023.

The spelling of 7870139 in words is "seven million, eight hundred seventy thousand, one hundred thirty-nine".