7971797 has 4 divisors (see below), whose sum is σ = 7997580. Its totient is φ = 7946016.

The previous prime is 7971787. The next prime is 7971833.

7971797 is nontrivially palindromic in base 10.

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 2430481 + 5541316 = 1559^2 + 2354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7971797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7971707) 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, 12422 + ... + 13047.

It is an arithmetic number, because the mean of its divisors is an integer number (1999395).

Almost surely, 2^7971797 is an apocalyptic number.

It is an amenable number.

7971797 is a deficient number, since it is larger than the sum of its proper divisors (25783).

7971797 is a wasteful number, since it uses less digits than its factorization.

7971797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25782.

The product of its digits is 194481, while the sum is 47.

The square root of 7971797 is about 2823.4370897897. The cubic root of 7971797 is about 199.7646982741.

The spelling of 7971797 in words is "seven million, nine hundred seventy-one thousand, seven hundred ninety-seven".