1685480 has 32 divisors (see below), whose sum is σ = 3925800. Its totient is φ = 650496.

The previous prime is 1685479. The next prime is 1685483. The reversal of 1685480 is 845861.

It can be written as a sum of positive squares in 4 ways, for example, as 1653796 + 31684 = 1286^2 + 178^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685483) 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 7 ways as a sum of consecutive naturals, for example, 434 + ... + 1886.

2^1685480 is an apocalyptic number.

1685480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1685480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1962900).

1685480 is an abundant number, since it is smaller than the sum of its proper divisors (2240320).

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

1685480 is a wasteful number, since it uses less digits than its factorization.

1685480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 1489 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1685480 is about 1298.2603745012. The cubic root of 1685480 is about 119.0075554838.

The spelling of 1685480 in words is "one million, six hundred eighty-five thousand, four hundred eighty".