1819945216 has 36 divisors (see below), whose sum is σ = 3635509500. Its totient is φ = 909289472.

The previous prime is 1819945189. The next prime is 1819945249. The reversal of 1819945216 is 6125499181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1451305216 + 368640000 = 38096^2 + 19200^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651150 + ... + 653938.

It is an arithmetic number, because the mean of its divisors is an integer number (100986375).

Almost surely, 2^1819945216 is an apocalyptic number.

1819945216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1819945216 is a deficient number, since it is larger than the sum of its proper divisors (1815564284).

1819945216 is an equidigital number, since it uses as much as digits as its factorization.

1819945216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5354 (or 5340 counting only the distinct ones).

The product of its digits is 155520, while the sum is 46.

The square root of 1819945216 is about 42660.8159321877. The cubic root of 1819945216 is about 1220.9168991875.

The spelling of 1819945216 in words is "one billion, eight hundred nineteen million, nine hundred forty-five thousand, two hundred sixteen".