2166428 has 24 divisors (see below), whose sum is σ = 4218480. Its totient is φ = 965120.

The previous prime is 2166427. The next prime is 2166431. The reversal of 2166428 is 8246612.

It is a self number, because there is not a number n which added to its sum of digits gives 2166428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1868 + ... + 2796.

It is an arithmetic number, because the mean of its divisors is an integer number (175770).

2^2166428 is an apocalyptic number.

It is an amenable number.

2166428 is a deficient number, since it is larger than the sum of its proper divisors (2052052).

2166428 is a wasteful number, since it uses less digits than its factorization.

2166428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997 (or 995 counting only the distinct ones).

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

The square root of 2166428 is about 1471.8790711196. The cubic root of 2166428 is about 129.3941831730.

The spelling of 2166428 in words is "two million, one hundred sixty-six thousand, four hundred twenty-eight".