170042 has 4 divisors (see below), whose sum is σ = 255066. Its totient is φ = 85020.

The previous prime is 170029. The next prime is 170047. The reversal of 170042 is 240071.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 152881 + 17161 = 391^2 + 131^2 .

It is a junction number, because it is equal to n+sod(n) for n = 169999 and 170026.

It is not an unprimeable number, because it can be changed into a prime (170047) by changing a digit.

170042 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42509 + ... + 42512.

2¹⁷⁰⁰⁴² is an apocalyptic number.

170042 is a deficient number, since it is larger than the sum of its proper divisors (85024).

170042 is an equidigital number, since it uses as much as digits as its factorization.

170042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85023.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 170042 is about 412.3614918976. The cubic root of 170042 is about 55.4011442634.

The spelling of 170042 in words is "one hundred seventy thousand, forty-two", and thus it is an iban number.