2166404 has 12 divisors (see below), whose sum is σ = 3913728. Its totient is φ = 1048200.

The previous prime is 2166403. The next prime is 2166407. The reversal of 2166404 is 4046612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166404.

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 3 ways as a sum of consecutive naturals, for example, 8612 + ... + 8859.

It is an arithmetic number, because the mean of its divisors is an integer number (326144).

2^2166404 is an apocalyptic number.

It is an amenable number.

2166404 is a deficient number, since it is larger than the sum of its proper divisors (1747324).

2166404 is a wasteful number, since it uses less digits than its factorization.

2166404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17506 (or 17504 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 2166404 is about 1471.8709182534. The cubic root of 2166404 is about 129.3937053555.

The spelling of 2166404 in words is "two million, one hundred sixty-six thousand, four hundred four".