1646891798 has 16 divisors (see below), whose sum is σ = 2484345600. Its totient is φ = 818788776.

The previous prime is 1646891773. The next prime is 1646891801. The reversal of 1646891798 is 8971986461.

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 7 ways as a sum of consecutive naturals, for example, 312461 + ... + 317687.

It is an arithmetic number, because the mean of its divisors is an integer number (155271600).

Almost surely, 2^1646891798 is an apocalyptic number.

1646891798 is a deficient number, since it is larger than the sum of its proper divisors (837453802).

1646891798 is a wasteful number, since it uses less digits than its factorization.

1646891798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6091.

The product of its digits is 5225472, while the sum is 59.

The square root of 1646891798 is about 40581.9146665112. The cubic root of 1646891798 is about 1180.9232929880.

The spelling of 1646891798 in words is "one billion, six hundred forty-six million, eight hundred ninety-one thousand, seven hundred ninety-eight".