438643 has 6 divisors (see below), whose sum is σ = 453332. Its totient is φ = 424200.

The previous prime is 438637. The next prime is 438661. The reversal of 438643 is 346834.

It is not a de Polignac number, because 438643 - 2⁵ = 438611 is a prime.

It is a Duffinian number.

Its product of digits (6912) is a multiple of the sum of its prime divisors (144).

It is not an unprimeable number, because it can be changed into a prime (438623) 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 5 ways as a sum of consecutive naturals, for example, 4293 + ... + 4393.

2⁴³⁸⁶⁴³ is an apocalyptic number.

438643 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

438643 is a deficient number, since it is larger than the sum of its proper divisors (14689).

438643 is an equidigital number, since it uses as much as digits as its factorization.

438643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 144 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 438643 is about 662.3012909545. The cubic root of 438643 is about 75.9807776871.

Subtracting from 438643 its reverse (346834), we obtain a square (91809 = 303²).

It can be divided in two parts, 438 and 643, that added together give a triangular number (1081 = T₄₆).

The spelling of 438643 in words is "four hundred thirty-eight thousand, six hundred forty-three".