821438234 has 8 divisors (see below), whose sum is σ = 1234608480. Its totient is φ = 409902076.

The previous prime is 821438231. The next prime is 821438243. The reversal of 821438234 is 432834128.

821438234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 821438194 and 821438203.

It is not an unprimeable number, because it can be changed into a prime (821438231) 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, 407264 + ... + 409275.

It is an arithmetic number, because the mean of its divisors is an integer number (154326060).

Almost surely, 2^821438234 is an apocalyptic number.

821438234 is a deficient number, since it is larger than the sum of its proper divisors (413170246).

821438234 is a wasteful number, since it uses less digits than its factorization.

821438234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817044.

The product of its digits is 36864, while the sum is 35.

The square root of 821438234 is about 28660.7437796021. The cubic root of 821438234 is about 936.5370674376.

The spelling of 821438234 in words is "eight hundred twenty-one million, four hundred thirty-eight thousand, two hundred thirty-four".