7138309 has 2 divisors, whose sum is σ = 7138310. Its totient is φ = 7138308.

The previous prime is 7138297. The next prime is 7138331. The reversal of 7138309 is 9038317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7128900 + 9409 = 2670^2 + 97^2 .

It is an emirp because it is prime and its reverse (9038317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7138309 - 2¹³ = 7130117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7138399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3569154 + 3569155.

It is an arithmetic number, because the mean of its divisors is an integer number (3569155).

Almost surely, 2^7138309 is an apocalyptic number.

It is an amenable number.

7138309 is a deficient number, since it is larger than the sum of its proper divisors (1).

7138309 is an equidigital number, since it uses as much as digits as its factorization.

7138309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 7138309 is about 2671.7614040180. The cubic root of 7138309 is about 192.5447942083.

It can be divided in two parts, 7138 and 309, that added together give a palindrome (7447).

The spelling of 7138309 in words is "seven million, one hundred thirty-eight thousand, three hundred nine".