1680995 has 4 divisors (see below), whose sum is σ = 2017200. Its totient is φ = 1344792.

The previous prime is 1680983. The next prime is 1681003. The reversal of 1680995 is 5990861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1680995 - 2⁴ = 1680979 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 168095 + ... + 168104.

It is an arithmetic number, because the mean of its divisors is an integer number (504300).

2^1680995 is an apocalyptic number.

1680995 is a deficient number, since it is larger than the sum of its proper divisors (336205).

1680995 is an equidigital number, since it uses as much as digits as its factorization.

1680995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336204.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1680995 is about 1296.5319124495. The cubic root of 1680995 is about 118.9019034804.

The spelling of 1680995 in words is "one million, six hundred eighty thousand, nine hundred ninety-five".