1820413216 has 12 divisors (see below), whose sum is σ = 3583938582. Its totient is φ = 910206592.

The previous prime is 1820413211. The next prime is 1820413219. The reversal of 1820413216 is 6123140281.

It can be written as a sum of positive squares in only one way, i.e., 1436410000 + 384003216 = 37900^2 + 19596^2 .

It is not an unprimeable number, because it can be changed into a prime (1820413211) by changing a digit.

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 as a sum of consecutive naturals, namely, 28443925 + ... + 28443988.

Almost surely, 2^1820413216 is an apocalyptic number.

1820413216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1820413216 is a deficient number, since it is larger than the sum of its proper divisors (1763525366).

1820413216 is an equidigital number, since it uses as much as digits as its factorization.

1820413216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56887923 (or 56887915 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1820413216 is about 42666.3007067639. The cubic root of 1820413216 is about 1221.0215433884.

Adding to 1820413216 its reverse (6123140281), we get a palindrome (7943553497).

The spelling of 1820413216 in words is "one billion, eight hundred twenty million, four hundred thirteen thousand, two hundred sixteen".