1803213 has 6 divisors (see below), whose sum is σ = 2604654. Its totient is φ = 1202136.

The previous prime is 1803211. The next prime is 1803227. The reversal of 1803213 is 3123081.

It can be written as a sum of positive squares in only one way, i.e., 915849 + 887364 = 957^2 + 942^2 .

It is not a de Polignac number, because 1803213 - 2¹ = 1803211 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1803211) 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, 100170 + ... + 100187.

It is an arithmetic number, because the mean of its divisors is an integer number (434109).

2^1803213 is an apocalyptic number.

It is an amenable number.

1803213 is a deficient number, since it is larger than the sum of its proper divisors (801441).

1803213 is a wasteful number, since it uses less digits than its factorization.

1803213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200363 (or 200360 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1803213 is about 1342.8376670320. The cubic root of 1803213 is about 121.7163750928.

Adding to 1803213 its reverse (3123081), we get a palindrome (4926294).

It can be divided in two parts, 1803 and 213, that added together give a triangular number (2016 = T₆₃).

The spelling of 1803213 in words is "one million, eight hundred three thousand, two hundred thirteen".