1680863449 has 4 divisors (see below), whose sum is σ = 1709352720. Its totient is φ = 1652374180.

The previous prime is 1680863413. The next prime is 1680863467. The reversal of 1680863449 is 9443680861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1680863449 - 2¹³ = 1680855257 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1680860449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14244547 + ... + 14244664.

It is an arithmetic number, because the mean of its divisors is an integer number (427338180).

Almost surely, 2^1680863449 is an apocalyptic number.

It is an amenable number.

1680863449 is a deficient number, since it is larger than the sum of its proper divisors (28489271).

1680863449 is an equidigital number, since it uses as much as digits as its factorization.

1680863449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28489270.

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 1680863449 is about 40998.3347100830. The cubic root of 1680863449 is about 1188.9880173169.

The spelling of 1680863449 in words is "one billion, six hundred eighty million, eight hundred sixty-three thousand, four hundred forty-nine".