1821044736 has 156 divisors (see below), whose sum is σ = 6012456112. Its totient is φ = 520224768.

The previous prime is 1821044723. The next prime is 1821044747. The reversal of 1821044736 is 6374401281.

1821044736 is a `hidden beast` number, since 1 + 82 + 104 + 473 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1821044736.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 254520 + ... + 261576.

Almost surely, 2^1821044736 is an apocalyptic number.

1821044736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821044736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3006228056).

1821044736 is an abundant number, since it is smaller than the sum of its proper divisors (4191411376).

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

1821044736 is an equidigital number, since it uses as much as digits as its factorization.

1821044736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7094 (or 7069 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 1821044736 is about 42673.7007535086. The cubic root of 1821044736 is about 1221.1627220263.

The spelling of 1821044736 in words is "one billion, eight hundred twenty-one million, forty-four thousand, seven hundred thirty-six".