2166605 has 16 divisors (see below), whose sum is σ = 3005184. Its totient is φ = 1468800.

The previous prime is 2166601. The next prime is 2166607. The reversal of 2166605 is 5066612.

It is not a de Polignac number, because 2166605 - 2² = 2166601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166601) 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, 3305 + ... + 3905.

It is an arithmetic number, because the mean of its divisors is an integer number (187824).

2^2166605 is an apocalyptic number.

2166605 is the 1202-nd pentagonal number.

It is an amenable number.

2166605 is a deficient number, since it is larger than the sum of its proper divisors (838579).

2166605 is a wasteful number, since it uses less digits than its factorization.

2166605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2166605 is about 1471.9391971138. The cubic root of 2166605 is about 129.3977069684.

The spelling of 2166605 in words is "two million, one hundred sixty-six thousand, six hundred five".