2166985 has 8 divisors (see below), whose sum is σ = 2661120. Its totient is φ = 1693104.

The previous prime is 2166977. The next prime is 2167003. The reversal of 2166985 is 5896612.

2166985 = 461² + 462² + ... + 470².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166985 - 2³ = 2166977 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4825 + ... + 5254.

It is an arithmetic number, because the mean of its divisors is an integer number (332640).

2^2166985 is an apocalyptic number.

It is an amenable number.

2166985 is a deficient number, since it is larger than the sum of its proper divisors (494135).

2166985 is a wasteful number, since it uses less digits than its factorization.

2166985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10127.

The product of its digits is 25920, while the sum is 37.

The square root of 2166985 is about 1472.0682728732. The cubic root of 2166985 is about 129.4052715305.

The spelling of 2166985 in words is "two million, one hundred sixty-six thousand, nine hundred eighty-five".