7938839 has 2 divisors, whose sum is σ = 7938840. Its totient is φ = 7938838.

The previous prime is 7938811. The next prime is 7938851. The reversal of 7938839 is 9388397.

It is a strong prime.

It is an emirp because it is prime and its reverse (9388397) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7938839 - 2⁸ = 7938583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7938793 and 7938802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7938859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969419 + 3969420.

It is an arithmetic number, because the mean of its divisors is an integer number (3969420).

Almost surely, 2^7938839 is an apocalyptic number.

7938839 is a deficient number, since it is larger than the sum of its proper divisors (1).

7938839 is an equidigital number, since it uses as much as digits as its factorization.

7938839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 7938839 is about 2817.5945414484. The cubic root of 7938839 is about 199.4890206121.

The spelling of 7938839 in words is "seven million, nine hundred thirty-eight thousand, eight hundred thirty-nine".