42155 has 4 divisors (see below), whose sum is σ = 50592. Its totient is φ = 33720.

The previous prime is 42139. The next prime is 42157. The reversal of 42155 is 55124.

42155 is nontrivially palindromic in base 14.

42155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 42155 - 2⁴ = 42139 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (42157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4211 + ... + 4220.

It is an arithmetic number, because the mean of its divisors is an integer number (12648).

2⁴²¹⁵⁵ is an apocalyptic number.

42155 is a deficient number, since it is larger than the sum of its proper divisors (8437).

42155 is an equidigital number, since it uses as much as digits as its factorization.

42155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8436.

The product of its digits is 200, while the sum is 17.

The square root of 42155 is about 205.3168283410. The cubic root of 42155 is about 34.8029745993.

Adding to 42155 its reverse (55124), we get a palindrome (97279).

The spelling of 42155 in words is "forty-two thousand, one hundred fifty-five".