9917389 has 2 divisors, whose sum is σ = 9917390. Its totient is φ = 9917388.

The previous prime is 9917387. The next prime is 9917399. The reversal of 9917389 is 9837199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9030025 + 887364 = 3005^2 + 942^2 .

It is a cyclic number.

It is not a de Polignac number, because 9917389 - 2¹ = 9917387 is a prime.

Together with 9917387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9917381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4958694 + 4958695.

It is an arithmetic number, because the mean of its divisors is an integer number (4958695).

Almost surely, 2^9917389 is an apocalyptic number.

It is an amenable number.

9917389 is a deficient number, since it is larger than the sum of its proper divisors (1).

9917389 is an equidigital number, since it uses as much as digits as its factorization.

9917389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 9917389 is about 3149.1886256622. The cubic root of 9917389 is about 214.8485611048.

The spelling of 9917389 in words is "nine million, nine hundred seventeen thousand, three hundred eighty-nine".