852421 has 4 divisors (see below), whose sum is σ = 864172. Its totient is φ = 840672.

The previous prime is 852409. The next prime is 852427. The reversal of 852421 is 124258.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124258 = 2 ⋅62129.

It can be written as a sum of positive squares in 2 ways, for example, as 616225 + 236196 = 785^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 852421 - 2¹¹ = 850373 is a prime.

It is a super-2 number, since 2×852421² = 1453243122482, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 852392 and 852401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (852427) 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, 5766 + ... + 5911.

It is an arithmetic number, because the mean of its divisors is an integer number (216043).

2⁸⁵²⁴²¹ is an apocalyptic number.

It is an amenable number.

852421 is a deficient number, since it is larger than the sum of its proper divisors (11751).

852421 is a wasteful number, since it uses less digits than its factorization.

852421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11750.

The product of its digits is 640, while the sum is 22.

The square root of 852421 is about 923.2664837413. The cubic root of 852421 is about 94.8166732292.

Adding to 852421 its reverse (124258), we get a palindrome (976679).

The spelling of 852421 in words is "eight hundred fifty-two thousand, four hundred twenty-one".