1689020643 has 8 divisors (see below), whose sum is σ = 2288946256. Its totient is φ = 1107554400.

The previous prime is 1689020629. The next prime is 1689020651. The reversal of 1689020643 is 3460209861.

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

It is not a de Polignac number, because 1689020643 - 2⁶ = 1689020579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689020653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4614628 + ... + 4614993.

It is an arithmetic number, because the mean of its divisors is an integer number (286118282).

Almost surely, 2^1689020643 is an apocalyptic number.

1689020643 is a deficient number, since it is larger than the sum of its proper divisors (599925613).

1689020643 is an equidigital number, since it uses as much as digits as its factorization.

1689020643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9229685.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 1689020643 is about 41097.6963223001. The cubic root of 1689020643 is about 1190.9082920275.

The spelling of 1689020643 in words is "one billion, six hundred eighty-nine million, twenty thousand, six hundred forty-three".