1686480 has 40 divisors (see below), whose sum is σ = 5228832. Its totient is φ = 449664.

The previous prime is 1686479. The next prime is 1686491. The reversal of 1686480 is 846861.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3274 + ... + 3753.

2^1686480 is an apocalyptic number.

1686480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1686480 is an abundant number, since it is smaller than the sum of its proper divisors (3542352).

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

1686480 is a wasteful number, since it uses less digits than its factorization.

1686480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043 (or 7037 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 1686480 is about 1298.6454481497. The cubic root of 1686480 is about 119.0310866693.

The spelling of 1686480 in words is "one million, six hundred eighty-six thousand, four hundred eighty".