1680965 has 16 divisors (see below), whose sum is σ = 2370816. Its totient is φ = 1128000.

The previous prime is 1680961. The next prime is 1680967. The reversal of 1680965 is 5690861.

It is not a de Polignac number, because 1680965 - 2² = 1680961 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461 + ... + 1890.

It is an arithmetic number, because the mean of its divisors is an integer number (148176).

2^1680965 is an apocalyptic number.

It is an amenable number.

1680965 is a deficient number, since it is larger than the sum of its proper divisors (689851).

1680965 is a wasteful number, since it uses less digits than its factorization.

1680965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2380.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 1680965 is about 1296.5203430722. The cubic root of 1680965 is about 118.9011961457.

The spelling of 1680965 in words is "one million, six hundred eighty thousand, nine hundred sixty-five".