1803684385 has 4 divisors (see below), whose sum is σ = 2164421268. Its totient is φ = 1442947504.

The previous prime is 1803684359. The next prime is 1803684427. The reversal of 1803684385 is 5834863081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1376187409 + 427496976 = 37097^2 + 20676^2 .

It is a cyclic number.

It is not a de Polignac number, because 1803684385 - 2²¹ = 1801587233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 180368434 + ... + 180368443.

It is an arithmetic number, because the mean of its divisors is an integer number (541105317).

Almost surely, 2^1803684385 is an apocalyptic number.

It is an amenable number.

1803684385 is a deficient number, since it is larger than the sum of its proper divisors (360736883).

1803684385 is an equidigital number, since it uses as much as digits as its factorization.

1803684385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360736882.

The product of its (nonzero) digits is 552960, while the sum is 46.

The square root of 1803684385 is about 42469.8055681916. The cubic root of 1803684385 is about 1217.2698028750.

The spelling of 1803684385 in words is "one billion, eight hundred three million, six hundred eighty-four thousand, three hundred eighty-five".