838121 has 4 divisors (see below), whose sum is σ = 845652. Its totient is φ = 830592.

The previous prime is 838099. The next prime is 838133. The reversal of 838121 is 121838.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121838 = 2 ⋅60919.

It can be written as a sum of positive squares in 2 ways, for example, as 290521 + 547600 = 539^2 + 740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-838121 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 838121.

It is not an unprimeable number, because it can be changed into a prime (838141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3596 + ... + 3821.

It is an arithmetic number, because the mean of its divisors is an integer number (211413).

2⁸³⁸¹²¹ is an apocalyptic number.

It is an amenable number.

838121 is a deficient number, since it is larger than the sum of its proper divisors (7531).

838121 is a wasteful number, since it uses less digits than its factorization.

838121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7530.

The product of its digits is 384, while the sum is 23.

The square root of 838121 is about 915.4894865590. The cubic root of 838121 is about 94.2834735354.

Adding to 838121 its reverse (121838), we get a palindrome (959959).

It can be divided in two parts, 838 and 121, that added together give a palindrome (959).

The spelling of 838121 in words is "eight hundred thirty-eight thousand, one hundred twenty-one".