667443 has 16 divisors (see below), whose sum is σ = 1045760. Its totient is φ = 370656.

The previous prime is 667441. The next prime is 667463. The reversal of 667443 is 344766.

It is not a de Polignac number, because 667443 - 2¹ = 667441 is a prime.

It is a Duffinian number.

667443 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 667443.

It is not an unprimeable number, because it can be changed into a prime (667441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348 + ... + 1206.

It is an arithmetic number, because the mean of its divisors is an integer number (65360).

2⁶⁶⁷⁴⁴³ is an apocalyptic number.

667443 is a deficient number, since it is larger than the sum of its proper divisors (378317).

667443 is a wasteful number, since it uses less digits than its factorization.

667443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its digits is 12096, while the sum is 30.

The square root of 667443 is about 816.9718477402. The cubic root of 667443 is about 87.3919428013.

The spelling of 667443 in words is "six hundred sixty-seven thousand, four hundred forty-three".