1680635 has 8 divisors (see below), whose sum is σ = 2200176. Its totient is φ = 1222240.

The previous prime is 1680617. The next prime is 1680643. The reversal of 1680635 is 5360861.

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

It is not a de Polignac number, because 1680635 - 2¹⁴ = 1664251 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1680598 and 1680607.

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, 15224 + ... + 15333.

It is an arithmetic number, because the mean of its divisors is an integer number (275022).

2^1680635 is an apocalyptic number.

1680635 is a deficient number, since it is larger than the sum of its proper divisors (519541).

1680635 is a wasteful number, since it uses less digits than its factorization.

1680635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30573.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1680635 is about 1296.3930731071. The cubic root of 1680635 is about 118.8934149084.

The spelling of 1680635 in words is "one million, six hundred eighty thousand, six hundred thirty-five".