9997957 has 2 divisors, whose sum is σ = 9997958. Its totient is φ = 9997956.

The previous prime is 9997951. The next prime is 9997969. The reversal of 9997957 is 7597999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7392961 + 2604996 = 2719^2 + 1614^2 .

It is a cyclic number.

It is not a de Polignac number, because 9997957 - 2⁷ = 9997829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9997898 and 9997907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9997951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998978 + 4998979.

It is an arithmetic number, because the mean of its divisors is an integer number (4998979).

Almost surely, 2^9997957 is an apocalyptic number.

It is an amenable number.

9997957 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997957 is an equidigital number, since it uses as much as digits as its factorization.

9997957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1607445, while the sum is 55.

The square root of 9997957 is about 3161.9546170051. The cubic root of 9997957 is about 215.4287963037.

The spelling of 9997957 in words is "nine million, nine hundred ninety-seven thousand, nine hundred fifty-seven".