143865 has 24 divisors (see below), whose sum is σ = 262080. Its totient is φ = 72864.

The previous prime is 143833. The next prime is 143873. The reversal of 143865 is 568341.

It is not a de Polignac number, because 143865 - 2⁵ = 143833 is a prime.

It is a d-powerful number, because it can be written as 1 + 4⁷ + 8³ + 3⁷ + 6⁶ + 5⁷ .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 143865.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 966 + ... + 1104.

It is an arithmetic number, because the mean of its divisors is an integer number (10920).

2¹⁴³⁸⁶⁵ is an apocalyptic number.

143865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

143865 is a deficient number, since it is larger than the sum of its proper divisors (118215).

143865 is a wasteful number, since it uses less digits than its factorization.

143865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 170 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 143865 is about 379.2953993921. The cubic root of 143865 is about 52.3984431292.

The spelling of 143865 in words is "one hundred forty-three thousand, eight hundred sixty-five".