7978279 has 2 divisors, whose sum is σ = 7978280. Its totient is φ = 7978278.

The previous prime is 7978247. The next prime is 7978301. The reversal of 7978279 is 9728797.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7978279 - 2⁵ = 7978247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7978379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989139 + 3989140.

It is an arithmetic number, because the mean of its divisors is an integer number (3989140).

Almost surely, 2^7978279 is an apocalyptic number.

7978279 is a deficient number, since it is larger than the sum of its proper divisors (1).

7978279 is an equidigital number, since it uses as much as digits as its factorization.

7978279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 49.

The square root of 7978279 is about 2824.5847482418. The cubic root of 7978279 is about 199.8188275990.

The spelling of 7978279 in words is "seven million, nine hundred seventy-eight thousand, two hundred seventy-nine".