143861 has 4 divisors (see below), whose sum is σ = 144672. Its totient is φ = 143052.

The previous prime is 143833. The next prime is 143873. The reversal of 143861 is 168341.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 168341 = 71 ⋅2371.

It is a cyclic number.

It is not a de Polignac number, because 143861 - 2⁶ = 143797 is a prime.

It is a Duffinian 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 143861.

It is not an unprimeable number, because it can be changed into a prime (143821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11 + ... + 536.

It is an arithmetic number, because the mean of its divisors is an integer number (36168).

2¹⁴³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

143861 is a deficient number, since it is larger than the sum of its proper divisors (811).

143861 is an equidigital number, since it uses as much as digits as its factorization.

143861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810.

The product of its digits is 576, while the sum is 23.

The square root of 143861 is about 379.2901264204. The cubic root of 143861 is about 52.3979574986.

The spelling of 143861 in words is "one hundred forty-three thousand, eight hundred sixty-one".