1808856 has 96 divisors (see below), whose sum is σ = 5809440. Its totient is φ = 497664.

The previous prime is 1808843. The next prime is 1808869. The reversal of 1808856 is 6588081.

It is an interprime number because it is at equal distance from previous prime (1808843) and next prime (1808869).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1808856.

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, 18600 + ... + 18696.

It is an arithmetic number, because the mean of its divisors is an integer number (60515).

2^1808856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1808856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2904720).

1808856 is an abundant number, since it is smaller than the sum of its proper divisors (4000584).

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

1808856 is a wasteful number, since it uses less digits than its factorization.

1808856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 1808856 is about 1344.9371732538. The cubic root of 1808856 is about 121.8432098545.

The spelling of 1808856 in words is "one million, eight hundred eight thousand, eight hundred fifty-six".