1035821 has 4 divisors (see below), whose sum is σ = 1038972. Its totient is φ = 1032672.

The previous prime is 1035791. The next prime is 1035829. The reversal of 1035821 is 1285301.

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

It can be written as a sum of positive squares in 2 ways, for example, as 346921 + 688900 = 589^2 + 830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1035821 is a prime.

It is a super-3 number, since 3×1035821³ = 3334075186877077983, which contains 333 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1035793 and 1035802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1035829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1016 + ... + 1761.

It is an arithmetic number, because the mean of its divisors is an integer number (259743).

2^1035821 is an apocalyptic number.

It is an amenable number.

1035821 is a deficient number, since it is larger than the sum of its proper divisors (3151).

1035821 is an equidigital number, since it uses as much as digits as its factorization.

1035821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3150.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1035821 is about 1017.7529169695. The cubic root of 1035821 is about 101.1800533003.

The spelling of 1035821 in words is "one million, thirty-five thousand, eight hundred twenty-one".