1821924 has 72 divisors (see below), whose sum is σ = 5274360. Its totient is φ = 525312.

The previous prime is 1821923. The next prime is 1821943. The reversal of 1821924 is 4291281.

It can be written as a sum of positive squares in 4 ways, for example, as 589824 + 1232100 = 768^2 + 1110^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821923) 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, 7842 + ... + 8070.

It is an arithmetic number, because the mean of its divisors is an integer number (73255).

2^1821924 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2637180).

1821924 is an abundant number, since it is smaller than the sum of its proper divisors (3452436).

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

1821924 is a wasteful number, since it uses less digits than its factorization.

1821924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 264 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1821924 is about 1349.7866498080. The cubic root of 1821924 is about 122.1359230407.

The spelling of 1821924 in words is "one million, eight hundred twenty-one thousand, nine hundred twenty-four".