7139939 has 2 divisors, whose sum is σ = 7139940. Its totient is φ = 7139938.

The previous prime is 7139933. The next prime is 7139947. The reversal of 7139939 is 9399317.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7139939 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7139896 and 7139905.

It is not a weakly prime, because it can be changed into another prime (7139933) 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, 3569969 + 3569970.

It is an arithmetic number, because the mean of its divisors is an integer number (3569970).

Almost surely, 2^7139939 is an apocalyptic number.

7139939 is a deficient number, since it is larger than the sum of its proper divisors (1).

7139939 is an equidigital number, since it uses as much as digits as its factorization.

7139939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45927, while the sum is 41.

The square root of 7139939 is about 2672.0664288150. The cubic root of 7139939 is about 192.5594486654.

The spelling of 7139939 in words is "seven million, one hundred thirty-nine thousand, nine hundred thirty-nine".