7139999 has 2 divisors, whose sum is σ = 7140000. Its totient is φ = 7139998.

The previous prime is 7139971. The next prime is 7140011. The reversal of 7139999 is 9999317.

It is a happy number.

7139999 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (9999317) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7139999 is a prime.

7139999 is a modest number, since divided by 9999 gives 713 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7139939) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3569999 + 3570000.

It is an arithmetic number, because the mean of its divisors is an integer number (3570000).

Almost surely, 2^7139999 is an apocalyptic number.

7139999 is a deficient number, since it is larger than the sum of its proper divisors (1).

7139999 is an equidigital number, since it uses as much as digits as its factorization.

7139999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137781, while the sum is 47.

The square root of 7139999 is about 2672.0776560572. The cubic root of 7139999 is about 192.5599880507.

The spelling of 7139999 in words is "seven million, one hundred thirty-nine thousand, nine hundred ninety-nine".