2166842 has 8 divisors (see below), whose sum is σ = 3303732. Its totient is φ = 1065600.

The previous prime is 2166833. The next prime is 2166877. The reversal of 2166842 is 2486612.

It can be written as a sum of positive squares in 2 ways, for example, as 1874161 + 292681 = 1369^2 + 541^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 8759 + ... + 9002.

2^2166842 is an apocalyptic number.

2166842 is a deficient number, since it is larger than the sum of its proper divisors (1136890).

2166842 is a wasteful number, since it uses less digits than its factorization.

2166842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17824.

The product of its digits is 4608, while the sum is 29.

The square root of 2166842 is about 1472.0197009551. The cubic root of 2166842 is about 129.4024249701.

The spelling of 2166842 in words is "two million, one hundred sixty-six thousand, eight hundred forty-two".