1816821842 has 32 divisors (see below), whose sum is σ = 3118003200. Its totient is φ = 785909520.

The previous prime is 1816821833. The next prime is 1816821859. The reversal of 1816821842 is 2481286181.

It is a self number, because there is not a number n which added to its sum of digits gives 1816821842.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91673 + ... + 109715.

It is an arithmetic number, because the mean of its divisors is an integer number (97437600).

Almost surely, 2^1816821842 is an apocalyptic number.

1816821842 is a deficient number, since it is larger than the sum of its proper divisors (1301181358).

1816821842 is a wasteful number, since it uses less digits than its factorization.

1816821842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18278.

The product of its digits is 49152, while the sum is 41.

The square root of 1816821842 is about 42624.1931536539. The cubic root of 1816821842 is about 1220.2180569652.

The spelling of 1816821842 in words is "one billion, eight hundred sixteen million, eight hundred twenty-one thousand, eight hundred forty-two".