1805481 has 6 divisors (see below), whose sum is σ = 2607930. Its totient is φ = 1203648.

The previous prime is 1805473. The next prime is 1805483. The reversal of 1805481 is 1845081.

1805481 is a `hidden beast` number, since 180 + 5 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 968256 + 837225 = 984^2 + 915^2 .

It is not a de Polignac number, because 1805481 - 2³ = 1805473 is a prime.

It is a super-2 number, since 2×1805481² = 6519523282722, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1805483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100296 + ... + 100313.

It is an arithmetic number, because the mean of its divisors is an integer number (434655).

2^1805481 is an apocalyptic number.

It is an amenable number.

1805481 is a deficient number, since it is larger than the sum of its proper divisors (802449).

1805481 is a wasteful number, since it uses less digits than its factorization.

1805481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200615 (or 200612 counting only the distinct ones).

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

The square root of 1805481 is about 1343.6818819944. The cubic root of 1805481 is about 121.7673835028.

The spelling of 1805481 in words is "one million, eight hundred five thousand, four hundred eighty-one".