821036 has 12 divisors (see below), whose sum is σ = 1454712. Its totient is φ = 405408.

The previous prime is 821027. The next prime is 821039. The reversal of 821036 is 630128.

It is a super-2 number, since 2×821036² = 1348200226592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 820999 and 821017.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 821036.

It is not an unprimeable number, because it can be changed into a prime (821039) by changing a digit.

821036 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, 905 + ... + 1568.

It is an arithmetic number, because the mean of its divisors is an integer number (121226).

2⁸²¹⁰³⁶ is an apocalyptic number.

It is an amenable number.

821036 is a deficient number, since it is larger than the sum of its proper divisors (633676).

821036 is a wasteful number, since it uses less digits than its factorization.

821036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560 (or 2558 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 821036 is about 906.1103685534. The cubic root of 821036 is about 93.6384177649.

The spelling of 821036 in words is "eight hundred twenty-one thousand, thirty-six".