7971287 has 4 divisors (see below), whose sum is σ = 7983240. Its totient is φ = 7959336.

The previous prime is 7971281. The next prime is 7971307. The reversal of 7971287 is 7821797.

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

It is a cyclic number.

It is not a de Polignac number, because 7971287 - 2⁸ = 7971031 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 (7971281) 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, 4913 + ... + 6330.

It is an arithmetic number, because the mean of its divisors is an integer number (1995810).

Almost surely, 2^7971287 is an apocalyptic number.

7971287 is a deficient number, since it is larger than the sum of its proper divisors (11953).

7971287 is a wasteful number, since it uses less digits than its factorization.

7971287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11952.

The product of its digits is 49392, while the sum is 41.

The square root of 7971287 is about 2823.3467728921. The cubic root of 7971287 is about 199.7604381652.

The spelling of 7971287 in words is "seven million, nine hundred seventy-one thousand, two hundred eighty-seven".