1687145 has 8 divisors (see below), whose sum is σ = 2033856. Its totient is φ = 1343536.

The previous prime is 1687139. The next prime is 1687151. The reversal of 1687145 is 5417861.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1687139) and next prime (1687151).

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

It is a cyclic number.

It is not a de Polignac number, because 1687145 - 2⁴ = 1687129 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

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, 674 + ... + 1956.

It is an arithmetic number, because the mean of its divisors is an integer number (254232).

2^1687145 is an apocalyptic number.

It is an amenable number.

1687145 is a deficient number, since it is larger than the sum of its proper divisors (346711).

1687145 is a wasteful number, since it uses less digits than its factorization.

1687145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551.

The product of its digits is 6720, while the sum is 32.

The square root of 1687145 is about 1298.9014589260. The cubic root of 1687145 is about 119.0467297584.

The spelling of 1687145 in words is "one million, six hundred eighty-seven thousand, one hundred forty-five".