2166788 has 12 divisors (see below), whose sum is σ = 4083660. Its totient is φ = 1000032.

The previous prime is 2166763. The next prime is 2166797. The reversal of 2166788 is 8876612.

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 1844164 = 568^2 + 1358^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20783 + ... + 20886.

It is an arithmetic number, because the mean of its divisors is an integer number (340305).

2^2166788 is an apocalyptic number.

It is an amenable number.

2166788 is a deficient number, since it is larger than the sum of its proper divisors (1916872).

2166788 is a wasteful number, since it uses less digits than its factorization.

2166788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41686 (or 41684 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 2166788 is about 1472.0013586950. The cubic root of 2166788 is about 129.4013500126.

The spelling of 2166788 in words is "two million, one hundred sixty-six thousand, seven hundred eighty-eight".