142865 has 4 divisors (see below), whose sum is σ = 171444.
Its totient is φ = 114288.
The previous prime is 142841. The next prime is 142867. The reversal of 142865 is 568241.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 16129 + 126736 = 127^2 + 356^2
It is a cyclic number.
It is not a de Polignac number, because 142865 - 28 = 142609 is a prime.
It is a Duffinian number.
It is a Curzon number.
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 142865.
It is not an unprimeable number, because it can be changed into a prime (142867) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14282 + ... + 14291.
It is an arithmetic number, because the mean of its divisors is an integer number (42861).
2142865 is an apocalyptic number.
It is an amenable number.
142865 is a deficient number, since it is larger than the sum of its proper divisors (28579).
142865 is an equidigital number, since it uses as much as digits as its factorization.
142865 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 28578.
The product of its digits is 1920, while the sum is 26.
The square root of 142865 is about 377.9748668893.
The cubic root of 142865 is about 52.2767542295.
The spelling of 142865 in words is "one hundred forty-two thousand, eight hundred sixty-five".