2166408 has 24 divisors (see below), whose sum is σ = 5867550. Its totient is φ = 722112.

The previous prime is 2166407. The next prime is 2166419. The reversal of 2166408 is 8046612.

2166408 is a `hidden beast` number, since 2 + 16 + 640 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1855044 + 311364 = 1362^2 + 558^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (2166403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14973 + ... + 15116.

2^2166408 is an apocalyptic number.

It is an amenable number.

2166408 is an abundant number, since it is smaller than the sum of its proper divisors (3701142).

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

2166408 is a wasteful number, since it uses less digits than its factorization.

2166408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30101 (or 30094 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 2166408 is about 1471.8722770675. The cubic root of 2166408 is about 129.3937849920.

The spelling of 2166408 in words is "two million, one hundred sixty-six thousand, four hundred eight".