1785040849 has 4 divisors (see below), whose sum is σ = 1787934564. Its totient is φ = 1782147136.

The previous prime is 1785040847. The next prime is 1785040877. The reversal of 1785040849 is 9480405871.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9480405871 = 97 ⋅97736143.

It can be written as a sum of positive squares in 2 ways, for example, as 81993025 + 1703047824 = 9055^2 + 41268^2 .

It is a cyclic number.

It is not a de Polignac number, because 1785040849 - 2¹ = 1785040847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1785040799 and 1785040808.

It is not an unprimeable number, because it can be changed into a prime (1785040841) by changing a digit.

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, 1445932 + ... + 1447165.

It is an arithmetic number, because the mean of its divisors is an integer number (446983641).

Almost surely, 2^1785040849 is an apocalyptic number.

It is an amenable number.

1785040849 is a deficient number, since it is larger than the sum of its proper divisors (2893715).

1785040849 is an equidigital number, since it uses as much as digits as its factorization.

1785040849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893714.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 1785040849 is about 42249.7437743710. The cubic root of 1785040849 is about 1213.0612215247.

The spelling of 1785040849 in words is "one billion, seven hundred eighty-five million, forty thousand, eight hundred forty-nine".