7975139 has 2 divisors, whose sum is σ = 7975140. Its totient is φ = 7975138.

The previous prime is 7975133. The next prime is 7975147. The reversal of 7975139 is 9315797.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7975139 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7975096 and 7975105.

It is not a weakly prime, because it can be changed into another prime (7975133) 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, 3987569 + 3987570.

It is an arithmetic number, because the mean of its divisors is an integer number (3987570).

Almost surely, 2^7975139 is an apocalyptic number.

7975139 is a deficient number, since it is larger than the sum of its proper divisors (1).

7975139 is an equidigital number, since it uses as much as digits as its factorization.

7975139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59535, while the sum is 41.

The square root of 7975139 is about 2824.0288596259. The cubic root of 7975139 is about 199.7926100213.

The spelling of 7975139 in words is "seven million, nine hundred seventy-five thousand, one hundred thirty-nine".