1821542016 has 64 divisors (see below), whose sum is σ = 5529689280. Its totient is φ = 520439808.

The previous prime is 1821542003. The next prime is 1821542053. The reversal of 1821542016 is 6102451281.

It is a tau number, because it is divible by the number of its divisors (64).

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 7 ways as a sum of consecutive naturals, for example, 336141 + ... + 341516.

It is an arithmetic number, because the mean of its divisors is an integer number (86401395).

Almost surely, 2^1821542016 is an apocalyptic number.

1821542016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1821542016 is an abundant number, since it is smaller than the sum of its proper divisors (3708147264).

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

1821542016 is an equidigital number, since it uses as much as digits as its factorization.

1821542016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677681 (or 677669 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1821542016 is about 42679.5268952223. The cubic root of 1821542016 is about 1221.2738678462.

Adding to 1821542016 its reverse (6102451281), we get a palindrome (7923993297).

The spelling of 1821542016 in words is "one billion, eight hundred twenty-one million, five hundred forty-two thousand, sixteen".