2166787 has 4 divisors (see below), whose sum is σ = 2476336. Its totient is φ = 1857240.

The previous prime is 2166763. The next prime is 2166797. The reversal of 2166787 is 7876612.

It is a happy number.

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

It is not a de Polignac number, because 2166787 - 2¹¹ = 2164739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154764 + ... + 154777.

It is an arithmetic number, because the mean of its divisors is an integer number (619084).

2^2166787 is an apocalyptic number.

2166787 is a deficient number, since it is larger than the sum of its proper divisors (309549).

2166787 is an equidigital number, since it uses as much as digits as its factorization.

2166787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309548.

The product of its digits is 28224, while the sum is 37.

The square root of 2166787 is about 1472.0010190214. The cubic root of 2166787 is about 129.4013301058.

The spelling of 2166787 in words is "two million, one hundred sixty-six thousand, seven hundred eighty-seven".