9988157 has 2 divisors, whose sum is σ = 9988158. Its totient is φ = 9988156.

The previous prime is 9988127. The next prime is 9988171. The reversal of 9988157 is 7518899.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6911641 + 3076516 = 2629^2 + 1754^2 .

It is a cyclic number.

It is not a de Polignac number, because 9988157 - 2¹² = 9984061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9988127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994078 + 4994079.

It is an arithmetic number, because the mean of its divisors is an integer number (4994079).

Almost surely, 2^9988157 is an apocalyptic number.

It is an amenable number.

9988157 is a deficient number, since it is larger than the sum of its proper divisors (1).

9988157 is an equidigital number, since it uses as much as digits as its factorization.

9988157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 47.

The square root of 9988157 is about 3160.4045627103. The cubic root of 9988157 is about 215.3583855061.

The spelling of 9988157 in words is "nine million, nine hundred eighty-eight thousand, one hundred fifty-seven".