2166534 has 32 divisors (see below), whose sum is σ = 4911840. Its totient is φ = 707616.

The previous prime is 2166533. The next prime is 2166547. The reversal of 2166534 is 4356612.

2166534 is a `hidden beast` number, since 2 + 1 + 6 + 653 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 2166498 and 2166507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166533) 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, 2484 + ... + 3240.

It is an arithmetic number, because the mean of its divisors is an integer number (153495).

2^2166534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2455920).

2166534 is an abundant number, since it is smaller than the sum of its proper divisors (2745306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166534 is a wasteful number, since it uses less digits than its factorization.

2166534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821 (or 815 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 2166534 is about 1471.9150790722. The cubic root of 2166534 is about 129.3962934916.

It can be divided in two parts, 216 and 6534, that multiplied together give a square (1411344 = 1188²).

The spelling of 2166534 in words is "two million, one hundred sixty-six thousand, five hundred thirty-four".