9920387 has 2 divisors, whose sum is σ = 9920388. Its totient is φ = 9920386.

The previous prime is 9920371. The next prime is 9920399. The reversal of 9920387 is 7830299.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9920387 - 2⁴ = 9920371 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9920387.

It is not a weakly prime, because it can be changed into another prime (9920347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960193 + 4960194.

It is an arithmetic number, because the mean of its divisors is an integer number (4960194).

Almost surely, 2^9920387 is an apocalyptic number.

9920387 is a deficient number, since it is larger than the sum of its proper divisors (1).

9920387 is an equidigital number, since it uses as much as digits as its factorization.

9920387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 9920387 is about 3149.6645853170. The cubic root of 9920387 is about 214.8702083042.

The spelling of 9920387 in words is "nine million, nine hundred twenty thousand, three hundred eighty-seven".