1687055 has 4 divisors (see below), whose sum is σ = 2024472. Its totient is φ = 1349640.

The previous prime is 1687039. The next prime is 1687057. The reversal of 1687055 is 5507861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5507861 = 313 ⋅17597.

It is not a de Polignac number, because 1687055 - 2⁴ = 1687039 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 (1687057) 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, 168701 + ... + 168710.

It is an arithmetic number, because the mean of its divisors is an integer number (506118).

2^1687055 is an apocalyptic number.

1687055 is a deficient number, since it is larger than the sum of its proper divisors (337417).

1687055 is an equidigital number, since it uses as much as digits as its factorization.

1687055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337416.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 1687055 is about 1298.8668138035. The cubic root of 1687055 is about 119.0446128892.

The spelling of 1687055 in words is "one million, six hundred eighty-seven thousand, fifty-five".