2166128 has 20 divisors (see below), whose sum is σ = 4311480. Its totient is φ = 1053504.

The previous prime is 2166127. The next prime is 2166137. The reversal of 2166128 is 8216612.

It is a super-2 number, since 2×2166128² = 9384221024768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2166097 and 2166106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1238 + ... + 2421.

It is an arithmetic number, because the mean of its divisors is an integer number (215574).

2^2166128 is an apocalyptic number.

It is an amenable number.

2166128 is a deficient number, since it is larger than the sum of its proper divisors (2145352).

2166128 is a wasteful number, since it uses less digits than its factorization.

2166128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704 (or 3698 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 2166128 is about 1471.7771570452. Note that the first 3 decimals coincide. The cubic root of 2166128 is about 129.3882102002.

The spelling of 2166128 in words is "two million, one hundred sixty-six thousand, one hundred twenty-eight".