1819563980 has 48 divisors (see below), whose sum is σ = 4126442880. Its totient is φ = 669973248.

The previous prime is 1819563979. The next prime is 1819564007. The reversal of 1819563980 is 893659181.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85886 + ... + 104954.

It is an arithmetic number, because the mean of its divisors is an integer number (85967560).

Almost surely, 2^1819563980 is an apocalyptic number.

1819563980 is a gapful number since it is divisible by the number (10) 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 1819563980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2063221440).

1819563980 is an abundant number, since it is smaller than the sum of its proper divisors (2306878900).

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

1819563980 is a wasteful number, since it uses less digits than its factorization.

1819563980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19458 (or 19456 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 1819563980 is about 42656.3474760791. The cubic root of 1819563980 is about 1220.8316420462.

The spelling of 1819563980 in words is "one billion, eight hundred nineteen million, five hundred sixty-three thousand, nine hundred eighty".