1809441 has 6 divisors (see below), whose sum is σ = 2613650. Its totient is φ = 1206288.

The previous prime is 1809421. The next prime is 1809449. The reversal of 1809441 is 1449081.

It can be written as a sum of positive squares in only one way, i.e., 1587600 + 221841 = 1260^2 + 471^2 .

It is not a de Polignac number, because 1809441 - 2¹⁵ = 1776673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1809449) 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, 100516 + ... + 100533.

2^1809441 is an apocalyptic number.

It is an amenable number.

1809441 is a deficient number, since it is larger than the sum of its proper divisors (804209).

1809441 is a wasteful number, since it uses less digits than its factorization.

1809441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201055 (or 201052 counting only the distinct ones).

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

The square root of 1809441 is about 1345.1546379506. The cubic root of 1809441 is about 121.8563434953.

The spelling of 1809441 in words is "one million, eight hundred nine thousand, four hundred forty-one".