438666 has 16 divisors (see below), whose sum is σ = 886464. Its totient is φ = 144704.

The previous prime is 438661. The next prime is 438667. The reversal of 438666 is 666834.

438666 is a modest number, since divided by 666 gives 438 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (438661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355 + ... + 1001.

It is an arithmetic number, because the mean of its divisors is an integer number (55404).

2⁴³⁸⁶⁶⁶ is an apocalyptic number.

438666 is an abundant number, since it is smaller than the sum of its proper divisors (447798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

438666 is a wasteful number, since it uses less digits than its factorization.

438666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765.

The product of its digits is 20736, while the sum is 33.

The square root of 438666 is about 662.3186544255. The cubic root of 438666 is about 75.9821056670.

The spelling of 438666 in words is "four hundred thirty-eight thousand, six hundred sixty-six".