7871947 has 4 divisors (see below), whose sum is σ = 8286280. Its totient is φ = 7457616.

The previous prime is 7871939. The next prime is 7871953. The reversal of 7871947 is 7491787.

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 7871947 - 2³ = 7871939 is a prime.

It is a d-powerful number, because it can be written as 7 + 8⁷ + 7⁴ + 1 + 9⁴ + 4⁵ + 7⁸ .

It is not an unprimeable number, because it can be changed into a prime (7871917) 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, 207138 + ... + 207175.

It is an arithmetic number, because the mean of its divisors is an integer number (2071570).

Almost surely, 2^7871947 is an apocalyptic number.

7871947 is a deficient number, since it is larger than the sum of its proper divisors (414333).

7871947 is a wasteful number, since it uses less digits than its factorization.

7871947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414332.

The product of its digits is 98784, while the sum is 43.

The square root of 7871947 is about 2805.6990216344. The cubic root of 7871947 is about 198.9271468882.

The spelling of 7871947 in words is "seven million, eight hundred seventy-one thousand, nine hundred forty-seven".