7897 has 4 divisors (see below), whose sum is σ = 8100. Its totient is φ = 7696.

The previous prime is 7883. The next prime is 7901. The reversal of 7897 is 7987.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3136 + 4761 = 56^2 + 69^2 .

It is a cyclic number.

It is not a de Polignac number, because 7897 - 2¹¹ = 5849 is a prime.

It is a Duffinian number.

7897 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22 + ... + 127.

It is an arithmetic number, because the mean of its divisors is an integer number (2025).

2⁷⁸⁹⁷ is an apocalyptic number.

7897 is the 48-th centered heptagonal number.

It is an amenable number.

7897 is a deficient number, since it is larger than the sum of its proper divisors (203).

7897 is a wasteful number, since it uses less digits than its factorization.

7897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202.

The product of its digits is 3528, while the sum is 31.

The square root of 7897 is about 88.8650662522. The cubic root of 7897 is about 19.9137956409.

The spelling of 7897 in words is "seven thousand, eight hundred ninety-seven".