1666223 has 8 divisors (see below), whose sum is σ = 1822128. Its totient is φ = 1514304.

The previous prime is 1666213. The next prime is 1666237. The reversal of 1666223 is 3226661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666223 - 2⁸ = 1665967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1666192 and 1666201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666213) 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 7 ways as a sum of consecutive naturals, for example, 86 + ... + 1827.

It is an arithmetic number, because the mean of its divisors is an integer number (227766).

2^1666223 is an apocalyptic number.

1666223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1666223 is a deficient number, since it is larger than the sum of its proper divisors (155905).

1666223 is a wasteful number, since it uses less digits than its factorization.

1666223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993.

The product of its digits is 2592, while the sum is 26.

The square root of 1666223 is about 1290.8226059378. The cubic root of 1666223 is about 118.5525887160.

The spelling of 1666223 in words is "one million, six hundred sixty-six thousand, two hundred twenty-three".