1821838384004 has 12 divisors (see below), whose sum is σ = 3188334228828. Its totient is φ = 910885747200.

The previous prime is 1821838383997. The next prime is 1821838384019. The reversal of 1821838384004 is 4004838381281.

It can be written as a sum of positive squares in 2 ways, for example, as 1380982223104 + 440856160900 = 1175152^2 + 663970^2 .

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, 8238437 + ... + 8456684.

It is an arithmetic number, because the mean of its divisors is an integer number (265694519069).

Almost surely, 2^{1821838384004} is an apocalyptic number.

It is an amenable number.

1821838384004 is a deficient number, since it is larger than the sum of its proper divisors (1366495844824).

1821838384004 is a wasteful number, since it uses less digits than its factorization.

1821838384004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16722406 (or 16722404 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 50.

The spelling of 1821838384004 in words is "one trillion, eight hundred twenty-one billion, eight hundred thirty-eight million, three hundred eighty-four thousand, four".