6861979 has 4 divisors (see below), whose sum is σ = 6869560. Its totient is φ = 6854400.

The previous prime is 6861977. The next prime is 6861997. The reversal of 6861979 is 9791686.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9791686 = 2 ⋅4895843.

It is a cyclic number.

It is not a de Polignac number, because 6861979 - 2¹ = 6861977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6861971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2214 + ... + 4315.

It is an arithmetic number, because the mean of its divisors is an integer number (1717390).

Almost surely, 2^6861979 is an apocalyptic number.

6861979 is a deficient number, since it is larger than the sum of its proper divisors (7581).

6861979 is a wasteful number, since it uses less digits than its factorization.

6861979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7580.

The product of its digits is 163296, while the sum is 46.

The square root of 6861979 is about 2619.5379363544. The cubic root of 6861979 is about 190.0275029439.

It can be divided in two parts, 686197 and 9, that added together give a triangular number (686206 = T₁₁₇₁).

The spelling of 6861979 in words is "six million, eight hundred sixty-one thousand, nine hundred seventy-nine".