1821764 has 12 divisors (see below), whose sum is σ = 3643584. Its totient is φ = 780744.

The previous prime is 1821763. The next prime is 1821779. The reversal of 1821764 is 4671281.

1821764 is an admirable number.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1821763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32504 + ... + 32559.

It is an arithmetic number, because the mean of its divisors is an integer number (303632).

2^1821764 is an apocalyptic number.

1821764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1821764 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1821764 is a wasteful number, since it uses less digits than its factorization.

1821764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65074 (or 65072 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 1821764 is about 1349.7273798808. The cubic root of 1821764 is about 122.1323476409.

It can be divided in two parts, 18217 and 64, that added together give a palindrome (18281).

The spelling of 1821764 in words is "one million, eight hundred twenty-one thousand, seven hundred sixty-four".