438155 has 4 divisors (see below), whose sum is σ = 525792. Its totient is φ = 350520.

The previous prime is 438143. The next prime is 438169. The reversal of 438155 is 551834.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551834 = 2 ⋅275917.

It is not a de Polignac number, because 438155 - 2⁶ = 438091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43811 + ... + 43820.

It is an arithmetic number, because the mean of its divisors is an integer number (131448).

2⁴³⁸¹⁵⁵ is an apocalyptic number.

438155 is a deficient number, since it is larger than the sum of its proper divisors (87637).

438155 is an equidigital number, since it uses as much as digits as its factorization.

438155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87636.

The product of its digits is 2400, while the sum is 26.

The square root of 438155 is about 661.9327760430. The cubic root of 438155 is about 75.9525904686.

Adding to 438155 its reverse (551834), we get a palindrome (989989).

The spelling of 438155 in words is "four hundred thirty-eight thousand, one hundred fifty-five".