7987897 has 2 divisors, whose sum is σ = 7987898. Its totient is φ = 7987896.

The previous prime is 7987883. The next prime is 7987901.

7987897 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5588496 + 2399401 = 2364^2 + 1549^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7987897 is a prime.

It is a super-4 number, since 4×7987897⁴ (a number of 29 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (7987867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3993948 + 3993949.

It is an arithmetic number, because the mean of its divisors is an integer number (3993949).

Almost surely, 2^7987897 is an apocalyptic number.

It is an amenable number.

7987897 is a deficient number, since it is larger than the sum of its proper divisors (1).

7987897 is an equidigital number, since it uses as much as digits as its factorization.

7987897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 55.

The square root of 7987897 is about 2826.2867865806. The cubic root of 7987897 is about 199.8990907619.

The spelling of 7987897 in words is "seven million, nine hundred eighty-seven thousand, eight hundred ninety-seven".