821234 has 4 divisors (see below), whose sum is σ = 1231854. Its totient is φ = 410616.

The previous prime is 821209. The next prime is 821263. The reversal of 821234 is 432128.

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

It can be written as a sum of positive squares in only one way, i.e., 819025 + 2209 = 905^2 + 47^2 .

It is a plaindrome in base 15.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 205307 + ... + 205310.

2⁸²¹²³⁴ is an apocalyptic number.

821234 is a deficient number, since it is larger than the sum of its proper divisors (410620).

821234 is a wasteful number, since it uses less digits than its factorization.

821234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410619.

The product of its digits is 384, while the sum is 20.

The square root of 821234 is about 906.2196201805. The cubic root of 821234 is about 93.6459444005.

The spelling of 821234 in words is "eight hundred twenty-one thousand, two hundred thirty-four".