421853 has 4 divisors (see below), whose sum is σ = 426300. Its totient is φ = 417408.

The previous prime is 421847. The next prime is 421891. The reversal of 421853 is 358124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 77284 + 344569 = 278^2 + 587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421453) 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, 2078 + ... + 2271.

It is an arithmetic number, because the mean of its divisors is an integer number (106575).

2⁴²¹⁸⁵³ is an apocalyptic number.

It is an amenable number.

421853 is a deficient number, since it is larger than the sum of its proper divisors (4447).

421853 is an equidigital number, since it uses as much as digits as its factorization.

421853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446.

The product of its digits is 960, while the sum is 23.

The square root of 421853 is about 649.5021170096. The cubic root of 421853 is about 74.9986962736.

Adding to 421853 its reverse (358124), we get a palindrome (779977).

The spelling of 421853 in words is "four hundred twenty-one thousand, eight hundred fifty-three".