2166994 has 4 divisors (see below), whose sum is σ = 3250494. Its totient is φ = 1083496.

The previous prime is 2166977. The next prime is 2167003. The reversal of 2166994 is 4996612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1292769 + 874225 = 1137^2 + 935^2 .

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 as a sum of consecutive naturals, namely, 541747 + ... + 541750.

2^2166994 is an apocalyptic number.

2166994 is a deficient number, since it is larger than the sum of its proper divisors (1083500).

2166994 is a wasteful number, since it uses less digits than its factorization.

2166994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083499.

The product of its digits is 23328, while the sum is 37.

The square root of 2166994 is about 1472.0713297935. The cubic root of 2166994 is about 129.4054506804.

It can be divided in two parts, 2166 and 994, that added together give a triangular number (3160 = T₇₉).

The spelling of 2166994 in words is "two million, one hundred sixty-six thousand, nine hundred ninety-four".