1791806440 has 16 divisors (see below), whose sum is σ = 4031564580. Its totient is φ = 716722560.

The previous prime is 1791806377. The next prime is 1791806453. The reversal of 1791806440 is 446081971.

It can be written as a sum of positive squares in 2 ways, for example, as 1786414756 + 5391684 = 42266^2 + 2322^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 44795161 = 1791806440 / (1 + 7 + 9 + 1 + 8 + 0 + 6 + 4 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1791806393 and 1791806402.

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 3 ways as a sum of consecutive naturals, for example, 22397541 + ... + 22397620.

Almost surely, 2^1791806440 is an apocalyptic number.

1791806440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1791806440 is an abundant number, since it is smaller than the sum of its proper divisors (2239758140).

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

1791806440 is a wasteful number, since it uses less digits than its factorization.

1791806440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44795172 (or 44795168 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1791806440 is about 42329.7347026886. The cubic root of 1791806440 is about 1214.5918548719.

The spelling of 1791806440 in words is "one billion, seven hundred ninety-one million, eight hundred six thousand, four hundred forty".