866541 has 16 divisors (see below), whose sum is σ = 1318464. Its totient is φ = 501504.

The previous prime is 866519. The next prime is 866573. The reversal of 866541 is 145668.

It is not a de Polignac number, because 866541 - 2⁶ = 866477 is a prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 866499 and 866508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10 + ... + 1316.

It is an arithmetic number, because the mean of its divisors is an integer number (82404).

2⁸⁶⁶⁵⁴¹ is an apocalyptic number.

It is an amenable number.

866541 is a deficient number, since it is larger than the sum of its proper divisors (451923).

866541 is a wasteful number, since it uses less digits than its factorization.

866541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340.

The product of its digits is 5760, while the sum is 30.

The square root of 866541 is about 930.8818399776. The cubic root of 866541 is about 95.3373417824.

The spelling of 866541 in words is "eight hundred sixty-six thousand, five hundred forty-one".