1856788920 has 160 divisors (see below), whose sum is σ = 7132514400. Its totient is φ = 424403712.

The previous prime is 1856788897. The next prime is 1856788937. The reversal of 1856788920 is 298876581.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18255 + ... + 63614.

It is an arithmetic number, because the mean of its divisors is an integer number (44578215).

Almost surely, 2^1856788920 is an apocalyptic number.

1856788920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1856788920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3566257200).

1856788920 is an abundant number, since it is smaller than the sum of its proper divisors (5275725480).

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

1856788920 is a wasteful number, since it uses less digits than its factorization.

1856788920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81899 (or 81886 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The square root of 1856788920 is about 43090.4736571786. The cubic root of 1856788920 is about 1229.1008300477.

The spelling of 1856788920 in words is "one billion, eight hundred fifty-six million, seven hundred eighty-eight thousand, nine hundred twenty".