1438666 has 4 divisors (see below), whose sum is σ = 2158002. Its totient is φ = 719332.

The previous prime is 1438663. The next prime is 1438667. The reversal of 1438666 is 6668341.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1274641 + 164025 = 1129^2 + 405^2 .

It is not an unprimeable number, because it can be changed into a prime (1438663) 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 as a sum of consecutive naturals, namely, 359665 + ... + 359668.

2^1438666 is an apocalyptic number.

1438666 is a deficient number, since it is larger than the sum of its proper divisors (719336).

1438666 is an equidigital number, since it uses as much as digits as its factorization.

1438666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719335.

The product of its digits is 20736, while the sum is 34.

The square root of 1438666 is about 1199.4440378775. Note that the first 3 decimals coincide. The cubic root of 1438666 is about 112.8894420794.

The spelling of 1438666 in words is "one million, four hundred thirty-eight thousand, six hundred sixty-six".