1821033 has 24 divisors (see below), whose sum is σ = 2785536. Its totient is φ = 1144800.

The previous prime is 1821019. The next prime is 1821037. The reversal of 1821033 is 3301281.

It is not a de Polignac number, because 1821033 - 2⁶ = 1820969 is a prime.

It is a super-2 number, since 2×1821033² = 6632322374178, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1820997 and 1821015.

It is not an unprimeable number, because it can be changed into a prime (1821037) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16966 + ... + 17072.

It is an arithmetic number, because the mean of its divisors is an integer number (116064).

2^1821033 is an apocalyptic number.

It is an amenable number.

1821033 is a deficient number, since it is larger than the sum of its proper divisors (964503).

1821033 is a wasteful number, since it uses less digits than its factorization.

1821033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1821033 is about 1349.4565572852. The cubic root of 1821033 is about 122.1160098698.

It can be divided in two parts, 182103 and 3, that added together give a triangular number (182106 = T₆₀₃).

The spelling of 1821033 in words is "one million, eight hundred twenty-one thousand, thirty-three".