7851979 has 2 divisors, whose sum is σ = 7851980. Its totient is φ = 7851978.

The previous prime is 7851973. The next prime is 7851989. The reversal of 7851979 is 9791587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7851979 - 2¹¹ = 7849931 is a prime.

It is not a weakly prime, because it can be changed into another prime (7851973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3925989 + 3925990.

It is an arithmetic number, because the mean of its divisors is an integer number (3925990).

Almost surely, 2^7851979 is an apocalyptic number.

7851979 is a deficient number, since it is larger than the sum of its proper divisors (1).

7851979 is an equidigital number, since it uses as much as digits as its factorization.

7851979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 46.

The square root of 7851979 is about 2802.1382906630. The cubic root of 7851979 is about 198.7588047732.

The spelling of 7851979 in words is "seven million, eight hundred fifty-one thousand, nine hundred seventy-nine".