143921 has 4 divisors (see below), whose sum is σ = 147312. Its totient is φ = 140532.

The previous prime is 143909. The next prime is 143947. The reversal of 143921 is 129341.

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.

It is a cyclic number.

It is not a de Polignac number, because 143921 - 2¹⁰ = 142897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 143893 and 143902.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 143921.

It is not an unprimeable number, because it can be changed into a prime (143971) 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, 1631 + ... + 1716.

It is an arithmetic number, because the mean of its divisors is an integer number (36828).

2¹⁴³⁹²¹ is an apocalyptic number.

It is an amenable number.

143921 is a deficient number, since it is larger than the sum of its proper divisors (3391).

143921 is an equidigital number, since it uses as much as digits as its factorization.

143921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390.

The product of its digits is 216, while the sum is 20.

The square root of 143921 is about 379.3692133002. The cubic root of 143921 is about 52.4052410118.

The spelling of 143921 in words is "one hundred forty-three thousand, nine hundred twenty-one".