6866539 has 4 divisors (see below), whose sum is σ = 6907824. Its totient is φ = 6825256.

The previous prime is 6866513. The next prime is 6866549. The reversal of 6866539 is 9356686.

6866539 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9356686 = 2 ⋅4678343.

It is a cyclic number.

It is not a de Polignac number, because 6866539 - 2⁷ = 6866411 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 6866495 and 6866504.

It is not an unprimeable number, because it can be changed into a prime (6866549) 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, 20392 + ... + 20725.

It is an arithmetic number, because the mean of its divisors is an integer number (1726956).

Almost surely, 2^6866539 is an apocalyptic number.

6866539 is a deficient number, since it is larger than the sum of its proper divisors (41285).

6866539 is a wasteful number, since it uses less digits than its factorization.

6866539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41284.

The product of its digits is 233280, while the sum is 43.

The square root of 6866539 is about 2620.4081743118. The cubic root of 6866539 is about 190.0695866994.

It can be divided in two parts, 686 and 6539, that added together give a square (7225 = 85²).

The spelling of 6866539 in words is "six million, eight hundred sixty-six thousand, five hundred thirty-nine".