1803861 has 12 divisors (see below), whose sum is σ = 2676492. Its totient is φ = 1169856.

The previous prime is 1803817. The next prime is 1803863. The reversal of 1803861 is 1683081.

It can be written as a sum of positive squares in 2 ways, for example, as 864900 + 938961 = 930^2 + 969^2 .

It is not a de Polignac number, because 1803861 - 2⁹ = 1803349 is a prime.

1803861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1803863) 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 11 ways as a sum of consecutive naturals, for example, 2376 + ... + 3041.

It is an arithmetic number, because the mean of its divisors is an integer number (223041).

2^1803861 is an apocalyptic number.

It is an amenable number.

1803861 is a deficient number, since it is larger than the sum of its proper divisors (872631).

1803861 is a wasteful number, since it uses less digits than its factorization.

1803861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5460 (or 5457 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1803861 is about 1343.0789254545. The cubic root of 1803861 is about 121.7309532865.

The spelling of 1803861 in words is "one million, eight hundred three thousand, eight hundred sixty-one".