7647971 has 4 divisors (see below), whose sum is σ = 7658832. Its totient is φ = 7637112.

The previous prime is 7647949. The next prime is 7647973. The reversal of 7647971 is 1797467.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7647971 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (7647973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4295 + ... + 5808.

It is an arithmetic number, because the mean of its divisors is an integer number (1914708).

Almost surely, 2^7647971 is an apocalyptic number.

7647971 is a deficient number, since it is larger than the sum of its proper divisors (10861).

7647971 is a wasteful number, since it uses less digits than its factorization.

7647971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10860.

The product of its digits is 74088, while the sum is 41.

The square root of 7647971 is about 2765.4965196145. The cubic root of 7647971 is about 197.0223118845.

The spelling of 7647971 in words is "seven million, six hundred forty-seven thousand, nine hundred seventy-one".