1680286979 has 6 divisors (see below), whose sum is σ = 1954619604. Its totient is φ = 1440245940.

The previous prime is 1680286973. The next prime is 1680286997. The reversal of 1680286979 is 9796820861.

It is not a de Polignac number, because 1680286979 - 2¹⁶ = 1680221443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1680286973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17145737 + ... + 17145834.

It is an arithmetic number, because the mean of its divisors is an integer number (325769934).

Almost surely, 2^1680286979 is an apocalyptic number.

1680286979 is a deficient number, since it is larger than the sum of its proper divisors (274332625).

1680286979 is an equidigital number, since it uses as much as digits as its factorization.

1680286979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34291585 (or 34291578 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 56.

The square root of 1680286979 is about 40991.3036996873. The cubic root of 1680286979 is about 1188.8520764121.

The spelling of 1680286979 in words is "one billion, six hundred eighty million, two hundred eighty-six thousand, nine hundred seventy-nine".