1686944005 has 4 divisors (see below), whose sum is σ = 2024332812. Its totient is φ = 1349555200.

The previous prime is 1686943969. The next prime is 1686944011. The reversal of 1686944005 is 5004496861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 593848161 + 1093095844 = 24369^2 + 33062^2 .

It is not a de Polignac number, because 1686944005 - 2⁷ = 1686943877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168694396 + ... + 168694405.

It is an arithmetic number, because the mean of its divisors is an integer number (506083203).

Almost surely, 2^1686944005 is an apocalyptic number.

It is an amenable number.

1686944005 is a deficient number, since it is larger than the sum of its proper divisors (337388807).

1686944005 is an equidigital number, since it uses as much as digits as its factorization.

1686944005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337388806.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 1686944005 is about 41072.4238997408. The cubic root of 1686944005 is about 1190.4200209766.

The spelling of 1686944005 in words is "one billion, six hundred eighty-six million, nine hundred forty-four thousand, five".