2166426 has 40 divisors (see below), whose sum is σ = 4983264. Its totient is φ = 703080.

The previous prime is 2166419. The next prime is 2166427. The reversal of 2166426 is 6246612.

It is a happy number.

2166426 is a `hidden beast` number, since 2 + 16 + 642 + 6 = 666.

It is a super-2 number, since 2×2166426² = 9386803226952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 2166426.

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 19 ways as a sum of consecutive naturals, for example, 6811 + ... + 7121.

2^2166426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2491632).

2166426 is an abundant number, since it is smaller than the sum of its proper divisors (2816838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166426 is a wasteful number, since it uses less digits than its factorization.

2166426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 359 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 2166426 is about 1471.8783917158. The cubic root of 2166426 is about 129.3941433550.

The spelling of 2166426 in words is "two million, one hundred sixty-six thousand, four hundred twenty-six".