1990682917 has 8 divisors (see below), whose sum is σ = 2072494616. Its totient is φ = 1910345472.

The previous prime is 1990682879. The next prime is 1990682929. The reversal of 1990682917 is 7192860991.

It can be written as a sum of positive squares in 4 ways, for example, as 803949316 + 1186733601 = 28354^2 + 34449^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1990682917 - 2¹¹ = 1990680869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990682017) 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 7 ways as a sum of consecutive naturals, for example, 365808 + ... + 371209.

It is an arithmetic number, because the mean of its divisors is an integer number (259061827).

Almost surely, 2^1990682917 is an apocalyptic number.

It is an amenable number.

1990682917 is a deficient number, since it is larger than the sum of its proper divisors (81811699).

1990682917 is an equidigital number, since it uses as much as digits as its factorization.

1990682917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737127.

The product of its (nonzero) digits is 489888, while the sum is 52.

The square root of 1990682917 is about 44617.0697939701. The cubic root of 1990682917 is about 1257.9615390841.

The spelling of 1990682917 in words is "one billion, nine hundred ninety million, six hundred eighty-two thousand, nine hundred seventeen".