165442 has 4 divisors (see below), whose sum is σ = 248166. Its totient is φ = 82720.

The previous prime is 165437. The next prime is 165443. The reversal of 165442 is 244561.

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., 159201 + 6241 = 399^2 + 79^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (165443) by changing a digit.

165442 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, 41359 + ... + 41362.

2¹⁶⁵⁴⁴² is an apocalyptic number.

165442 is a deficient number, since it is larger than the sum of its proper divisors (82724).

165442 is an equidigital number, since it uses as much as digits as its factorization.

165442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82723.

The product of its digits is 960, while the sum is 22.

The square root of 165442 is about 406.7456207509. The cubic root of 165442 is about 54.8969973021.

The spelling of 165442 in words is "one hundred sixty-five thousand, four hundred forty-two".