1445666 has 4 divisors (see below), whose sum is σ = 2168502. Its totient is φ = 722832.

The previous prime is 1445657. The next prime is 1445669. The reversal of 1445666 is 6665441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6665441 = 1151 ⋅5791.

It can be written as a sum of positive squares in only one way, i.e., 1042441 + 403225 = 1021^2 + 635^2 .

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1445669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361415 + ... + 361418.

2^1445666 is an apocalyptic number.

1445666 is a deficient number, since it is larger than the sum of its proper divisors (722836).

1445666 is an equidigital number, since it uses as much as digits as its factorization.

1445666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722835.

The product of its digits is 17280, while the sum is 32.

The square root of 1445666 is about 1202.3585155851. The cubic root of 1445666 is about 113.0722382488.

The spelling of 1445666 in words is "one million, four hundred forty-five thousand, six hundred sixty-six".