6861879 has 12 divisors (see below), whose sum is σ = 9940632. Its totient is φ = 4561200.

The previous prime is 6861851. The next prime is 6861913. The reversal of 6861879 is 9781686.

Added to its reverse (9781686) it gives a triangular number (16643565 = T₅₇₆₉).

It is a happy number.

6861879 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6861879 - 2⁵ = 6861847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6861809) 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, 2884 + ... + 4694.

It is an arithmetic number, because the mean of its divisors is an integer number (828386).

Almost surely, 2^6861879 is an apocalyptic number.

6861879 is a deficient number, since it is larger than the sum of its proper divisors (3078753).

6861879 is a wasteful number, since it uses less digits than its factorization.

6861879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238 (or 2235 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 6861879 is about 2619.5188489492. The cubic root of 6861879 is about 190.0265798456.

Adding to 6861879 its reverse (9781686), we get a triangular number (16643565 = T₅₇₆₉).

The spelling of 6861879 in words is "six million, eight hundred sixty-one thousand, eight hundred seventy-nine".