438646 has 8 divisors (see below), whose sum is σ = 708624. Its totient is φ = 202440.

The previous prime is 438637. The next prime is 438661. The reversal of 438646 is 646834.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8410 + ... + 8461.

It is an arithmetic number, because the mean of its divisors is an integer number (88578).

2⁴³⁸⁶⁴⁶ is an apocalyptic number.

438646 is a deficient number, since it is larger than the sum of its proper divisors (269978).

438646 is a wasteful number, since it uses less digits than its factorization.

438646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16886.

The product of its digits is 13824, while the sum is 31.

The square root of 438646 is about 662.3035557809. The cubic root of 438646 is about 75.9809509045.

The spelling of 438646 in words is "four hundred thirty-eight thousand, six hundred forty-six".