1821024 has 36 divisors (see below), whose sum is σ = 5179356. Its totient is φ = 606912.

The previous prime is 1821019. The next prime is 1821037. The reversal of 1821024 is 4201281.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1821024² = 6632256817152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1820988 and 1821006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2874 + ... + 3449.

It is an arithmetic number, because the mean of its divisors is an integer number (143871).

2^1821024 is an apocalyptic number.

It is an amenable number.

1821024 is an abundant number, since it is smaller than the sum of its proper divisors (3358332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821024 is a wasteful number, since it uses less digits than its factorization.

1821024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6339 (or 6328 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1821024 is about 1349.4532226054. The cubic root of 1821024 is about 122.1158086935.

It can be divided in two parts, 182102 and 4, that added together give a triangular number (182106 = T₆₀₃).

The spelling of 1821024 in words is "one million, eight hundred twenty-one thousand, twenty-four".