1819844845 has 16 divisors (see below), whose sum is σ = 2687771520. Its totient is φ = 1151901504.

The previous prime is 1819844837. The next prime is 1819844861. The reversal of 1819844845 is 5484489181.

It is not a de Polignac number, because 1819844845 - 2³ = 1819844837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1819844792 and 1819844801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1999375 + ... + 2000284.

It is an arithmetic number, because the mean of its divisors is an integer number (167985720).

Almost surely, 2^1819844845 is an apocalyptic number.

It is an amenable number.

1819844845 is a deficient number, since it is larger than the sum of its proper divisors (867926675).

1819844845 is a wasteful number, since it uses less digits than its factorization.

1819844845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999684.

The product of its digits is 1474560, while the sum is 52.

The square root of 1819844845 is about 42659.6395319979. The cubic root of 1819844845 is about 1220.8944540242.

The spelling of 1819844845 in words is "one billion, eight hundred nineteen million, eight hundred forty-four thousand, eight hundred forty-five".