438166 has 4 divisors (see below), whose sum is σ = 657252. Its totient is φ = 219082.

The previous prime is 438143. The next prime is 438169. The reversal of 438166 is 661834.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661834 = 2 ⋅330917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109540 + ... + 109543.

It is an arithmetic number, because the mean of its divisors is an integer number (164313).

2⁴³⁸¹⁶⁶ is an apocalyptic number.

438166 is a deficient number, since it is larger than the sum of its proper divisors (219086).

438166 is a wasteful number, since it uses less digits than its factorization.

438166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219085.

The product of its digits is 3456, while the sum is 28.

The square root of 438166 is about 661.9410849917. The cubic root of 438166 is about 75.9532260667.

The spelling of 438166 in words is "four hundred thirty-eight thousand, one hundred sixty-six".