1666422 has 24 divisors (see below), whose sum is σ = 3696264. Its totient is φ = 542304.

The previous prime is 1666421. The next prime is 1666429. The reversal of 1666422 is 2246661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 303 + ... + 1850.

It is an arithmetic number, because the mean of its divisors is an integer number (154011).

2^1666422 is an apocalyptic number.

1666422 is an abundant number, since it is smaller than the sum of its proper divisors (2029842).

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

1666422 is a wasteful number, since it uses less digits than its factorization.

1666422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204 (or 2201 counting only the distinct ones).

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

The square root of 1666422 is about 1290.8996862654. The cubic root of 1666422 is about 118.5573081776.

Adding to 1666422 its product of digits (3456), we get a triangular number (1669878 = T₁₈₂₇).

The spelling of 1666422 in words is "one million, six hundred sixty-six thousand, four hundred twenty-two".