1827621980 has 24 divisors (see below), whose sum is σ = 3895292688. Its totient is φ = 720137088.

The previous prime is 1827621977. The next prime is 1827622001. The reversal of 1827621980 is 891267281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680609 + ... + 683288.

It is an arithmetic number, because the mean of its divisors is an integer number (162303862).

Almost surely, 2^1827621980 is an apocalyptic number.

1827621980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1827621980 is an abundant number, since it is smaller than the sum of its proper divisors (2067670708).

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

1827621980 is a wasteful number, since it uses less digits than its factorization.

1827621980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363973 (or 1363971 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 1827621980 is about 42750.6956668544. The cubic root of 1827621980 is about 1222.6311528557.

The spelling of 1827621980 in words is "one billion, eight hundred twenty-seven million, six hundred twenty-one thousand, nine hundred eighty".