1679369985 has 24 divisors (see below), whose sum is σ = 2917258344. Its totient is φ = 893710080.

The previous prime is 1679369981. The next prime is 1679369999. The reversal of 1679369985 is 5899639761.

It can be written as a sum of positive squares in 4 ways, for example, as 9585216 + 1669784769 = 3096^2 + 40863^2 .

It is not a de Polignac number, because 1679369985 - 2² = 1679369981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1679369981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19732 + ... + 61221.

It is an arithmetic number, because the mean of its divisors is an integer number (121552431).

Almost surely, 2^1679369985 is an apocalyptic number.

1679369985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1679369985 is a deficient number, since it is larger than the sum of its proper divisors (1237888359).

1679369985 is a wasteful number, since it uses less digits than its factorization.

1679369985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81425 (or 81422 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 63.

The square root of 1679369985 is about 40980.1169471245. The cubic root of 1679369985 is about 1188.6357703862.

The spelling of 1679369985 in words is "one billion, six hundred seventy-nine million, three hundred sixty-nine thousand, nine hundred eighty-five".