1816920844 has 12 divisors (see below), whose sum is σ = 3183218584. Its totient is φ = 907429824.

The previous prime is 1816920823. The next prime is 1816920851. The reversal of 1816920844 is 4480296181.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1816920844.

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 3 ways as a sum of consecutive naturals, for example, 253677 + ... + 260740.

Almost surely, 2^1816920844 is an apocalyptic number.

It is an amenable number.

1816920844 is a deficient number, since it is larger than the sum of its proper divisors (1366297740).

1816920844 is a wasteful number, since it uses less digits than its factorization.

1816920844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515304 (or 515302 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 1816920844 is about 42625.3544735994. The cubic root of 1816920844 is about 1220.2402205461.

The spelling of 1816920844 in words is "one billion, eight hundred sixteen million, nine hundred twenty thousand, eight hundred forty-four".