438406 has 16 divisors (see below), whose sum is σ = 705600. Its totient is φ = 203688.

The previous prime is 438401. The next prime is 438409. The reversal of 438406 is 604834.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438401) 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, 3085 + ... + 3223.

It is an arithmetic number, because the mean of its divisors is an integer number (44100).

2⁴³⁸⁴⁰⁶ is an apocalyptic number.

438406 is a deficient number, since it is larger than the sum of its proper divisors (267194).

438406 is a wasteful number, since it uses less digits than its factorization.

438406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 438406 is about 662.1223451901. The cubic root of 438406 is about 75.9670910152.

The spelling of 438406 in words is "four hundred thirty-eight thousand, four hundred six".