7871866 has 8 divisors (see below), whose sum is σ = 11830464. Its totient is φ = 3928380.

The previous prime is 7871863. The next prime is 7871873. The reversal of 7871866 is 6681787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (7871863) 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, 2370 + ... + 4621.

It is an arithmetic number, because the mean of its divisors is an integer number (1478808).

Almost surely, 2^7871866 is an apocalyptic number.

7871866 is a deficient number, since it is larger than the sum of its proper divisors (3958598).

7871866 is a wasteful number, since it uses less digits than its factorization.

7871866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7556.

The product of its digits is 112896, while the sum is 43.

The square root of 7871866 is about 2805.6845866918. The cubic root of 7871866 is about 198.9264645855.

The spelling of 7871866 in words is "seven million, eight hundred seventy-one thousand, eight hundred sixty-six".