1805856 has 48 divisors (see below), whose sum is σ = 5108544. Its totient is φ = 555264.

The previous prime is 1805833. The next prime is 1805857. The reversal of 1805856 is 6585081.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1805856² = 6522231785472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1805857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525 + ... + 1971.

It is an arithmetic number, because the mean of its divisors is an integer number (106428).

2^1805856 is an apocalyptic number.

1805856 is a gapful number since it is divisible by the number (16) 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 1805856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2554272).

1805856 is an abundant number, since it is smaller than the sum of its proper divisors (3302688).

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

1805856 is a wasteful number, since it uses less digits than its factorization.

1805856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 1805856 is about 1343.8214167068. The cubic root of 1805856 is about 121.7758133170.

The spelling of 1805856 in words is "one million, eight hundred five thousand, eight hundred fifty-six".