7881959 has 2 divisors, whose sum is σ = 7881960. Its totient is φ = 7881958.

The previous prime is 7881919. The next prime is 7881961. The reversal of 7881959 is 9591887.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7881959 - 2¹⁶ = 7816423 is a prime.

It is a Sophie Germain prime.

Together with 7881961, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7881919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940979 + 3940980.

It is an arithmetic number, because the mean of its divisors is an integer number (3940980).

Almost surely, 2^7881959 is an apocalyptic number.

7881959 is a deficient number, since it is larger than the sum of its proper divisors (1).

7881959 is an equidigital number, since it uses as much as digits as its factorization.

7881959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 47.

The square root of 7881959 is about 2807.4826802671. The cubic root of 7881959 is about 199.0114468639.

The spelling of 7881959 in words is "seven million, eight hundred eighty-one thousand, nine hundred fifty-nine".