1803649 has 9 divisors (see below), whose sum is σ = 1940547. Its totient is φ = 1676064.

The previous prime is 1803647. The next prime is 1803667. The reversal of 1803649 is 9463081.

The square root of 1803649 is 1343.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1404225 + 399424 = 1185^2 + 632^2 .

It is not a de Polignac number, because 1803649 - 2¹ = 1803647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1803649.

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 8 ways as a sum of consecutive naturals, for example, 22792 + ... + 22870.

2^1803649 is an apocalyptic number.

1803649 is the 1343-rd square number.

1803649 is the 672-nd centered octagonal number.

It is an amenable number.

1803649 is a deficient number, since it is larger than the sum of its proper divisors (136898).

1803649 is an frugal number, since it uses more digits than its factorization.

1803649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The cubic root of 1803649 is about 121.7261842618.

Multiplying 1803649 by its product of nonzero digits (5184), we get a square (9350116416 = 96696²).

The spelling of 1803649 in words is "one million, eight hundred three thousand, six hundred forty-nine".