1683990005 has 4 divisors (see below), whose sum is σ = 2020788012. Its totient is φ = 1347192000.

The previous prime is 1683989933. The next prime is 1683990013. The reversal of 1683990005 is 5000993861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5000993861 = 787 ⋅6354503.

It can be written as a sum of positive squares in 2 ways, for example, as 278789809 + 1405200196 = 16697^2 + 37486^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1683990005 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168398996 + ... + 168399005.

It is an arithmetic number, because the mean of its divisors is an integer number (505197003).

Almost surely, 2^1683990005 is an apocalyptic number.

It is an amenable number.

1683990005 is a deficient number, since it is larger than the sum of its proper divisors (336798007).

1683990005 is an equidigital number, since it uses as much as digits as its factorization.

1683990005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336798006.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 1683990005 is about 41036.4472755622. The cubic root of 1683990005 is about 1189.7247686334.

The spelling of 1683990005 in words is "one billion, six hundred eighty-three million, nine hundred ninety thousand, five".