1686141 has 6 divisors (see below), whose sum is σ = 2435550. Its totient is φ = 1124088.

The previous prime is 1686137. The next prime is 1686143. The reversal of 1686141 is 1416861.

It can be written as a sum of positive squares in only one way, i.e., 1625625 + 60516 = 1275^2 + 246^2 .

It is not a de Polignac number, because 1686141 - 2² = 1686137 is a prime.

1686141 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93666 + ... + 93683.

It is an arithmetic number, because the mean of its divisors is an integer number (405925).

2^1686141 is an apocalyptic number.

It is an amenable number.

1686141 is a deficient number, since it is larger than the sum of its proper divisors (749409).

1686141 is a wasteful number, since it uses less digits than its factorization.

1686141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187355 (or 187352 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1686141 is about 1298.5149209770. The cubic root of 1686141 is about 119.0231106399.

The spelling of 1686141 in words is "one million, six hundred eighty-six thousand, one hundred forty-one".