7978793 has 2 divisors, whose sum is σ = 7978794. Its totient is φ = 7978792.

The previous prime is 7978783. The next prime is 7978807. The reversal of 7978793 is 3978797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7661824 + 316969 = 2768^2 + 563^2 .

It is a cyclic number.

It is not a de Polignac number, because 7978793 - 2⁴ = 7978777 is a prime.

It is a super-2 number, since 2×7978793² = 127322275473698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7978753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989396 + 3989397.

It is an arithmetic number, because the mean of its divisors is an integer number (3989397).

Almost surely, 2^7978793 is an apocalyptic number.

It is an amenable number.

7978793 is a deficient number, since it is larger than the sum of its proper divisors (1).

7978793 is an equidigital number, since it uses as much as digits as its factorization.

7978793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 50.

The square root of 7978793 is about 2824.6757336020. The cubic root of 7978793 is about 199.8231186110.

The spelling of 7978793 in words is "seven million, nine hundred seventy-eight thousand, seven hundred ninety-three".