1682785009 has 4 divisors (see below), whose sum is σ = 1682870004. Its totient is φ = 1682700016.

The previous prime is 1682784953. The next prime is 1682785021. The reversal of 1682785009 is 9005872861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9005872861 = 3413 ⋅2638697.

It can be written as a sum of positive squares in 2 ways, for example, as 1180128609 + 502656400 = 34353^2 + 22420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1682785009 - 2⁷ = 1682784881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1682785009.

It is not an unprimeable number, because it can be changed into a prime (1682785309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4599 + ... + 58195.

It is an arithmetic number, because the mean of its divisors is an integer number (420717501).

Almost surely, 2^1682785009 is an apocalyptic number.

It is an amenable number.

1682785009 is a deficient number, since it is larger than the sum of its proper divisors (84995).

1682785009 is an equidigital number, since it uses as much as digits as its factorization.

1682785009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84994.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 1682785009 is about 41021.7626266839. The cubic root of 1682785009 is about 1189.4409277427.

The spelling of 1682785009 in words is "one billion, six hundred eighty-two million, seven hundred eighty-five thousand, nine".