9687989 has 2 divisors, whose sum is σ = 9687990. Its totient is φ = 9687988.

The previous prime is 9687947. The next prime is 9688031. The reversal of 9687989 is 9897869.

It is a balanced prime because it is at equal distance from previous prime (9687947) and next prime (9688031).

It can be written as a sum of positive squares in only one way, i.e., 9394225 + 293764 = 3065^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 9687989 - 2²⁰ = 8639413 is a 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 (9687919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4843994 + 4843995.

It is an arithmetic number, because the mean of its divisors is an integer number (4843995).

Almost surely, 2^9687989 is an apocalyptic number.

It is an amenable number.

9687989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9687989 is an equidigital number, since it uses as much as digits as its factorization.

9687989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 56.

The square root of 9687989 is about 3112.5534533563. The cubic root of 9687989 is about 213.1790613710.

The spelling of 9687989 in words is "nine million, six hundred eighty-seven thousand, nine hundred eighty-nine".