838221 has 4 divisors (see below), whose sum is σ = 1117632. Its totient is φ = 558812.

The previous prime is 838207. The next prime is 838247. The reversal of 838221 is 122838.

838221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 838221 - 2⁶ = 838157 is a prime.

It is a super-2 number, since 2×838221² = 1405228889682, which contains 22 as substring.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 838191 and 838200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838021) 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, 139701 + ... + 139706.

It is an arithmetic number, because the mean of its divisors is an integer number (279408).

2⁸³⁸²²¹ is an apocalyptic number.

It is an amenable number.

838221 is a deficient number, since it is larger than the sum of its proper divisors (279411).

838221 is a wasteful number, since it uses less digits than its factorization.

838221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279410.

The product of its digits is 768, while the sum is 24.

The square root of 838221 is about 915.5441005217. The cubic root of 838221 is about 94.2872231819.

The spelling of 838221 in words is "eight hundred thirty-eight thousand, two hundred twenty-one".