1821004332 has 24 divisors (see below), whose sum is σ = 4856011776. Its totient is φ = 520286928.

The previous prime is 1821004309. The next prime is 1821004333. The reversal of 1821004332 is 2334001281.

It is not an unprimeable number, because it can be changed into a prime (1821004333) 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 7 ways as a sum of consecutive naturals, for example, 10839228 + ... + 10839395.

It is an arithmetic number, because the mean of its divisors is an integer number (202333824).

Almost surely, 2^1821004332 is an apocalyptic number.

1821004332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1821004332 is an abundant number, since it is smaller than the sum of its proper divisors (3035007444).

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

1821004332 is a wasteful number, since it uses less digits than its factorization.

1821004332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21678637 (or 21678635 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1821004332 is about 42673.2273445541. The cubic root of 1821004332 is about 1221.1536905396.

The spelling of 1821004332 in words is "one billion, eight hundred twenty-one million, four thousand, three hundred thirty-two".