1821487808 has 28 divisors (see below), whose sum is σ = 4130875152. Its totient is φ = 780637440.

The previous prime is 1821487799. The next prime is 1821487847. The reversal of 1821487808 is 8087841281.

It is a tau number, because it is divible by the number of its divisors (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2032463 + ... + 2033358.

Almost surely, 2^1821487808 is an apocalyptic number.

It is an amenable number.

1821487808 is an abundant number, since it is smaller than the sum of its proper divisors (2309387344).

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

1821487808 is an equidigital number, since it uses as much as digits as its factorization.

1821487808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4065840 (or 4065830 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 47.

The square root of 1821487808 is about 42678.8918319115. The cubic root of 1821487808 is about 1221.2617529330.

The spelling of 1821487808 in words is "one billion, eight hundred twenty-one million, four hundred eighty-seven thousand, eight hundred eight".