421793143 has 4 divisors (see below), whose sum is σ = 423603648. Its totient is φ = 419982640.

The previous prime is 421793129. The next prime is 421793153. The reversal of 421793143 is 341397124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421793143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421793099 and 421793108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421793153) 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, 904903 + ... + 905368.

It is an arithmetic number, because the mean of its divisors is an integer number (105900912).

Almost surely, 2^421793143 is an apocalyptic number.

421793143 is a deficient number, since it is larger than the sum of its proper divisors (1810505).

421793143 is a wasteful number, since it uses less digits than its factorization.

421793143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810504.

The product of its digits is 18144, while the sum is 34.

The square root of 421793143 is about 20537.6031464239. The cubic root of 421793143 is about 749.9514890105.

The spelling of 421793143 in words is "four hundred twenty-one million, seven hundred ninety-three thousand, one hundred forty-three".