438215 has 4 divisors (see below), whose sum is σ = 525864. Its totient is φ = 350568.

The previous prime is 438211. The next prime is 438223. The reversal of 438215 is 512834.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 438215 - 2² = 438211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43817 + ... + 43826.

It is an arithmetic number, because the mean of its divisors is an integer number (131466).

2⁴³⁸²¹⁵ is an apocalyptic number.

438215 is a deficient number, since it is larger than the sum of its proper divisors (87649).

438215 is an equidigital number, since it uses as much as digits as its factorization.

438215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87648.

The product of its digits is 960, while the sum is 23.

The square root of 438215 is about 661.9780963144. The cubic root of 438215 is about 75.9560572383.

The spelling of 438215 in words is "four hundred thirty-eight thousand, two hundred fifteen".