1681560 has 96 divisors (see below), whose sum is σ = 5700240. Its totient is φ = 445824.

The previous prime is 1681541. The next prime is 1681571. The reversal of 1681560 is 651861.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9634 + ... + 9806.

2^1681560 is an apocalyptic number.

1681560 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 1681560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2850120).

1681560 is an abundant number, since it is smaller than the sum of its proper divisors (4018680).

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

1681560 is a wasteful number, since it uses less digits than its factorization.

1681560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1681560 is about 1296.7497831116. The cubic root of 1681560 is about 118.9152233793.

It can be divided in two parts, 168 and 1560, that added together give a cube (1728 = 12³).

The spelling of 1681560 in words is "one million, six hundred eighty-one thousand, five hundred sixty".