820238 has 4 divisors (see below), whose sum is σ = 1230360. Its totient is φ = 410118.

The previous prime is 820231. The next prime is 820241. The reversal of 820238 is 832028.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205058 + ... + 205061.

It is an arithmetic number, because the mean of its divisors is an integer number (307590).

2⁸²⁰²³⁸ is an apocalyptic number.

820238 is a deficient number, since it is larger than the sum of its proper divisors (410122).

820238 is a wasteful number, since it uses less digits than its factorization.

820238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410121.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 820238 is about 905.6699177957. The cubic root of 820238 is about 93.6080708700.

The spelling of 820238 in words is "eight hundred twenty thousand, two hundred thirty-eight".