7978339 has 2 divisors, whose sum is σ = 7978340. Its totient is φ = 7978338.

The previous prime is 7978337. The next prime is 7978343. The reversal of 7978339 is 9338797.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7978339 - 2¹ = 7978337 is a prime.

Together with 7978337, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7978331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989169 + 3989170.

It is an arithmetic number, because the mean of its divisors is an integer number (3989170).

Almost surely, 2^7978339 is an apocalyptic number.

7978339 is a deficient number, since it is larger than the sum of its proper divisors (1).

7978339 is an equidigital number, since it uses as much as digits as its factorization.

7978339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 46.

The square root of 7978339 is about 2824.5953692520. The cubic root of 7978339 is about 199.8193285049.

The spelling of 7978339 in words is "seven million, nine hundred seventy-eight thousand, three hundred thirty-nine".