1821963980 has 24 divisors (see below), whose sum is σ = 3832351488. Its totient is φ = 727599488.

The previous prime is 1821963937. The next prime is 1821964019. The reversal of 1821963980 is 893691281.

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 7 ways as a sum of consecutive naturals, for example, 61484 + ... + 86163.

It is an arithmetic number, because the mean of its divisors is an integer number (159681312).

Almost surely, 2^1821963980 is an apocalyptic number.

1821963980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1821963980 is an abundant number, since it is smaller than the sum of its proper divisors (2010387508).

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

1821963980 is a wasteful number, since it uses less digits than its factorization.

1821963980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148273 (or 148271 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 1821963980 is about 42684.4700095948. The cubic root of 1821963980 is about 1221.3681641099.

The spelling of 1821963980 in words is "one billion, eight hundred twenty-one million, nine hundred sixty-three thousand, nine hundred eighty".