7886861 has 12 divisors (see below), whose sum is σ = 8739612. Its totient is φ = 7092096.

The previous prime is 7886833. The next prime is 7886867. The reversal of 7886861 is 1686887.

It can be written as a sum of positive squares in 2 ways, for example, as 6400900 + 1485961 = 2530^2 + 1219^2 .

It is not a de Polignac number, because 7886861 - 2⁶ = 7886797 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 (7886867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8555 + ... + 9431.

It is an arithmetic number, because the mean of its divisors is an integer number (728301).

Almost surely, 2^7886861 is an apocalyptic number.

It is an amenable number.

7886861 is a deficient number, since it is larger than the sum of its proper divisors (852751).

7886861 is a wasteful number, since it uses less digits than its factorization.

7886861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940 (or 917 counting only the distinct ones).

The product of its digits is 129024, while the sum is 44.

The square root of 7886861 is about 2808.3555686558. The cubic root of 7886861 is about 199.0526951518.

The spelling of 7886861 in words is "seven million, eight hundred eighty-six thousand, eight hundred sixty-one".