665142 has 16 divisors (see below), whose sum is σ = 1408752. Its totient is φ = 208640.

The previous prime is 665141. The next prime is 665153. The reversal of 665142 is 241566.

It is a plaindrome in base 9.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665142.

It is not an unprimeable number, because it can be changed into a prime (665141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3159 + ... + 3362.

It is an arithmetic number, because the mean of its divisors is an integer number (88047).

2⁶⁶⁵¹⁴² is an apocalyptic number.

665142 is an abundant number, since it is smaller than the sum of its proper divisors (743610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665142 is a wasteful number, since it uses less digits than its factorization.

665142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6543.

The product of its digits is 1440, while the sum is 24.

The square root of 665142 is about 815.5623826538. The cubic root of 665142 is about 87.2913996900.

The spelling of 665142 in words is "six hundred sixty-five thousand, one hundred forty-two".