1680287 has 4 divisors (see below), whose sum is σ = 1920336. Its totient is φ = 1440240.

The previous prime is 1680277. The next prime is 1680313. The reversal of 1680287 is 7820861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7820861 = 149 ⋅52489.

It is a cyclic number.

It is not a de Polignac number, because 1680287 - 2⁴ = 1680271 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 (1680247) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 120014 + ... + 120027.

It is an arithmetic number, because the mean of its divisors is an integer number (480084).

2^1680287 is an apocalyptic number.

1680287 is a deficient number, since it is larger than the sum of its proper divisors (240049).

1680287 is an equidigital number, since it uses as much as digits as its factorization.

1680287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240048.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 1680287 is about 1296.2588476072. The cubic root of 1680287 is about 118.8852081365.

The spelling of 1680287 in words is "one million, six hundred eighty thousand, two hundred eighty-seven".