7971855 has 8 divisors (see below), whose sum is σ = 12754992. Its totient is φ = 4251648.

The previous prime is 7971853. The next prime is 7971871. The reversal of 7971855 is 5581797.

7971855 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 7971855 - 2¹ = 7971853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7971851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265714 + ... + 265743.

It is an arithmetic number, because the mean of its divisors is an integer number (1594374).

Almost surely, 2^7971855 is an apocalyptic number.

7971855 is a deficient number, since it is larger than the sum of its proper divisors (4783137).

7971855 is a wasteful number, since it uses less digits than its factorization.

7971855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531465.

The product of its digits is 88200, while the sum is 42.

The square root of 7971855 is about 2823.4473609402. The cubic root of 7971855 is about 199.7651827455.

The spelling of 7971855 in words is "seven million, nine hundred seventy-one thousand, eight hundred fifty-five".