2166745 has 16 divisors (see below), whose sum is σ = 3068928. Its totient is φ = 1437120.

The previous prime is 2166721. The next prime is 2166763. The reversal of 2166745 is 5476612.

It is a happy number.

2166745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2166745 - 2⁹ = 2166233 is a prime.

It is a super-4 number, since 4×2166745⁴ (a number of 26 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (191808).

2^2166745 is an apocalyptic number.

It is an amenable number.

2166745 is a deficient number, since it is larger than the sum of its proper divisors (902183).

2166745 is a wasteful number, since it uses less digits than its factorization.

2166745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its digits is 10080, while the sum is 31.

The square root of 2166745 is about 1471.9867526578. The cubic root of 2166745 is about 129.4004940152.

It can be divided in two parts, 21667 and 45, that added together give a palindrome (21712).

The spelling of 2166745 in words is "two million, one hundred sixty-six thousand, seven hundred forty-five".