202143423 has 4 divisors (see below), whose sum is σ = 269524568. Its totient is φ = 134762280.

The previous prime is 202143421. The next prime is 202143433. The reversal of 202143423 is 324341202.

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

It is not a de Polignac number, because 202143423 - 2¹ = 202143421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202143423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202143421) 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, 33690568 + ... + 33690573.

It is an arithmetic number, because the mean of its divisors is an integer number (67381142).

Almost surely, 2^202143423 is an apocalyptic number.

202143423 is a deficient number, since it is larger than the sum of its proper divisors (67381145).

202143423 is an equidigital number, since it uses as much as digits as its factorization.

202143423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67381144.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 202143423 is about 14217.7151117892. The cubic root of 202143423 is about 586.8852642182.

Adding to 202143423 its reverse (324341202), we get a palindrome (526484625).

It can be divided in two parts, 202143 and 423, that added together give a triangular number (202566 = T₆₃₆).

The spelling of 202143423 in words is "two hundred two million, one hundred forty-three thousand, four hundred twenty-three".