821936 has 20 divisors (see below), whose sum is σ = 1627872. Its totient is φ = 401856.

The previous prime is 821911. The next prime is 821939. The reversal of 821936 is 639128.

It is a junction number, because it is equal to n+sod(n) for n = 821899 and 821908.

It is not an unprimeable number, because it can be changed into a prime (821939) by changing a digit.

821936 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206 + ... + 1298.

2⁸²¹⁹³⁶ is an apocalyptic number.

It is an amenable number.

821936 is a deficient number, since it is larger than the sum of its proper divisors (805936).

821936 is a wasteful number, since it uses less digits than its factorization.

821936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1142 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 821936 is about 906.6068607726. The cubic root of 821936 is about 93.6726200010.

The spelling of 821936 in words is "eight hundred twenty-one thousand, nine hundred thirty-six".