1841805 has 32 divisors (see below), whose sum is σ = 3744000. Its totient is φ = 841536.

The previous prime is 1841783. The next prime is 1841821. The reversal of 1841805 is 5081481.

It is not a de Polignac number, because 1841805 - 2⁹ = 1841293 is a prime.

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

1841805 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30 + ... + 1919.

It is an arithmetic number, because the mean of its divisors is an integer number (117000).

2^1841805 is an apocalyptic number.

1841805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1841805 is an abundant number, since it is smaller than the sum of its proper divisors (1902195).

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

1841805 is a wasteful number, since it uses less digits than its factorization.

1841805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970 (or 1964 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 1841805 is about 1357.1311653632. The cubic root of 1841805 is about 122.5785696153.

The spelling of 1841805 in words is "one million, eight hundred forty-one thousand, eight hundred five".