7963947389 has 2 divisors, whose sum is σ = 7963947390. Its totient is φ = 7963947388.

The previous prime is 7963947373. The next prime is 7963947401. The reversal of 7963947389 is 9837493697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7544312164 + 419635225 = 86858^2 + 20485^2 .

It is a cyclic number.

It is not a de Polignac number, because 7963947389 - 2⁴ = 7963947373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7963947319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3981973694 + 3981973695.

It is an arithmetic number, because the mean of its divisors is an integer number (3981973695).

Almost surely, 2^7963947389 is an apocalyptic number.

It is an amenable number.

7963947389 is a deficient number, since it is larger than the sum of its proper divisors (1).

7963947389 is an equidigital number, since it uses as much as digits as its factorization.

7963947389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61725888, while the sum is 65.

The square root of 7963947389 is about 89240.9513003980. The cubic root of 7963947389 is about 1996.9910912542.

The spelling of 7963947389 in words is "seven billion, nine hundred sixty-three million, nine hundred forty-seven thousand, three hundred eighty-nine".