1686140 has 12 divisors (see below), whose sum is σ = 3540936. Its totient is φ = 674448.

The previous prime is 1686137. The next prime is 1686143. The reversal of 1686140 is 416861.

It is an interprime number because it is at equal distance from previous prime (1686137) and next prime (1686143).

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 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, 42134 + ... + 42173.

It is an arithmetic number, because the mean of its divisors is an integer number (295078).

2^1686140 is an apocalyptic number.

1686140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1686140 is an abundant number, since it is smaller than the sum of its proper divisors (1854796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686140 is a wasteful number, since it uses less digits than its factorization.

1686140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84316 (or 84314 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1686140 is about 1298.5145359217. The cubic root of 1686140 is about 119.0230871102.

The spelling of 1686140 in words is "one million, six hundred eighty-six thousand, one hundred forty".