1686380 has 12 divisors (see below), whose sum is σ = 3541440. Its totient is φ = 674544.

The previous prime is 1686367. The next prime is 1686389. The reversal of 1686380 is 836861.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1686389) 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, 42140 + ... + 42179.

It is an arithmetic number, because the mean of its divisors is an integer number (295120).

2^1686380 is an apocalyptic number.

1686380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1686380 is an abundant number, since it is smaller than the sum of its proper divisors (1855060).

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

1686380 is a wasteful number, since it uses less digits than its factorization.

1686380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84328 (or 84326 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1686380 is about 1298.6069459232. The cubic root of 1686380 is about 119.0287339694.

The spelling of 1686380 in words is "one million, six hundred eighty-six thousand, three hundred eighty".