9987457 has 2 divisors, whose sum is σ = 9987458. Its totient is φ = 9987456.

The previous prime is 9987443. The next prime is 9987493. The reversal of 9987457 is 7547899.

It is a happy number.

9987457 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9678321 + 309136 = 3111^2 + 556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9987457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9987457.

It is not a weakly prime, because it can be changed into another prime (9987427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993728 + 4993729.

It is an arithmetic number, because the mean of its divisors is an integer number (4993729).

Almost surely, 2^9987457 is an apocalyptic number.

It is an amenable number.

9987457 is a deficient number, since it is larger than the sum of its proper divisors (1).

9987457 is an equidigital number, since it uses as much as digits as its factorization.

9987457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 49.

The square root of 9987457 is about 3160.2938154545. The cubic root of 9987457 is about 215.3533544014.

The spelling of 9987457 in words is "nine million, nine hundred eighty-seven thousand, four hundred fifty-seven".