7889920387 has 2 divisors, whose sum is σ = 7889920388. Its totient is φ = 7889920386.

The previous prime is 7889920349. The next prime is 7889920393. The reversal of 7889920387 is 7830299887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7889920387 - 2¹⁵ = 7889887619 is a prime.

It is not a weakly prime, because it can be changed into another prime (7889920307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3944960193 + 3944960194.

It is an arithmetic number, because the mean of its divisors is an integer number (3944960194).

Almost surely, 2^7889920387 is an apocalyptic number.

7889920387 is a deficient number, since it is larger than the sum of its proper divisors (1).

7889920387 is an equidigital number, since it uses as much as digits as its factorization.

7889920387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12192768, while the sum is 61.

The square root of 7889920387 is about 88825.2238218402. The cubic root of 7889920387 is about 1990.7842995729.

The spelling of 7889920387 in words is "seven billion, eight hundred eighty-nine million, nine hundred twenty thousand, three hundred eighty-seven".