1803641 has 6 divisors (see below), whose sum is σ = 2098170. Its totient is φ = 1545936.

The previous prime is 1803629. The next prime is 1803647. The reversal of 1803641 is 1463081.

It can be written as a sum of positive squares in only one way, i.e., 1449616 + 354025 = 1204^2 + 595^2 .

It is not a de Polignac number, because 1803641 - 2⁶ = 1803577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1803647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18356 + ... + 18453.

It is an arithmetic number, because the mean of its divisors is an integer number (349695).

2^1803641 is an apocalyptic number.

It is an amenable number.

1803641 is a deficient number, since it is larger than the sum of its proper divisors (294529).

1803641 is an equidigital number, since it uses as much as digits as its factorization.

1803641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36823 (or 36816 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1803641 is about 1342.9970215901. The cubic root of 1803641 is about 121.7260042913.

The spelling of 1803641 in words is "one million, eight hundred three thousand, six hundred forty-one".