1666224 has 160 divisors (see below), whose sum is σ = 5952000. Its totient is φ = 435456.

The previous prime is 1666213. The next prime is 1666237. The reversal of 1666224 is 4226661.

It is a happy number.

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

It is a nude number because it is divisible by every one of its digits.

Its product of digits (3456) is a multiple of the sum of its prime factors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57442 + ... + 57470.

It is an arithmetic number, because the mean of its divisors is an integer number (37200).

2^1666224 is an apocalyptic number.

1666224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2976000).

1666224 is an abundant number, since it is smaller than the sum of its proper divisors (4285776).

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

1666224 is a wasteful number, since it uses less digits than its factorization.

1666224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 60 counting only the distinct ones).

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

The square root of 1666224 is about 1290.8229932876. The cubic root of 1666224 is about 118.5526124329.

The spelling of 1666224 in words is "one million, six hundred sixty-six thousand, two hundred twenty-four".