1680871639 has 8 divisors (see below), whose sum is σ = 1739298960. Its totient is φ = 1622475456.

The previous prime is 1680871541. The next prime is 1680871649. The reversal of 1680871639 is 9361780861.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1680871639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1680871592 and 1680871601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680871649) 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, 175632 + ... + 184954.

It is an arithmetic number, because the mean of its divisors is an integer number (217412370).

Almost surely, 2^1680871639 is an apocalyptic number.

1680871639 is a deficient number, since it is larger than the sum of its proper divisors (58427321).

1680871639 is an equidigital number, since it uses as much as digits as its factorization.

1680871639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15569.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 1680871639 is about 40998.4345920670. The cubic root of 1680871639 is about 1188.9899484268.

The spelling of 1680871639 in words is "one billion, six hundred eighty million, eight hundred seventy-one thousand, six hundred thirty-nine".