1666144 has 12 divisors (see below), whose sum is σ = 3280284. Its totient is φ = 833056.

The previous prime is 1666139. The next prime is 1666151. The reversal of 1666144 is 4416661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26002 + ... + 26065.

It is an arithmetic number, because the mean of its divisors is an integer number (273357).

2^1666144 is an apocalyptic number.

It is an amenable number.

1666144 is a deficient number, since it is larger than the sum of its proper divisors (1614140).

1666144 is an equidigital number, since it uses as much as digits as its factorization.

1666144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52077 (or 52069 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 1666144 is about 1290.7920049334. The cubic root of 1666144 is about 118.5507150568.

The spelling of 1666144 in words is "one million, six hundred sixty-six thousand, one hundred forty-four".