2166993 has 20 divisors (see below), whose sum is σ = 3345408. Its totient is φ = 1396440.

The previous prime is 2166977. The next prime is 2167003. The reversal of 2166993 is 3996612.

It is not a de Polignac number, because 2166993 - 2⁴ = 2166977 is a prime.

2166993 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2166943) 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 19 ways as a sum of consecutive naturals, for example, 2080 + ... + 2942.

2^2166993 is an apocalyptic number.

It is an amenable number.

2166993 is a deficient number, since it is larger than the sum of its proper divisors (1178415).

2166993 is an equidigital number, since it uses as much as digits as its factorization.

2166993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906 (or 897 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 2166993 is about 1472.0709901360. The cubic root of 2166993 is about 129.4054307749.

The spelling of 2166993 in words is "two million, one hundred sixty-six thousand, nine hundred ninety-three".