1801680 has 40 divisors (see below), whose sum is σ = 5585952. Its totient is φ = 480384.

The previous prime is 1801673. The next prime is 1801691. The reversal of 1801680 is 861081.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1801680.

It is a congruent number.

It is an unprimeable number.

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, 3514 + ... + 3993.

2^1801680 is an apocalyptic number.

1801680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1801680 is an abundant number, since it is smaller than the sum of its proper divisors (3784272).

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

1801680 is a wasteful number, since it uses less digits than its factorization.

1801680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7523 (or 7517 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 1801680 is about 1342.2667395119. The cubic root of 1801680 is about 121.6818729560.

The spelling of 1801680 in words is "one million, eight hundred one thousand, six hundred eighty".