1801813 has 16 divisors (see below), whose sum is σ = 2128896. Its totient is φ = 1509120.

The previous prime is 1801781. The next prime is 1801817. The reversal of 1801813 is 3181081.

It is a cyclic number.

It is not a de Polignac number, because 1801813 - 2⁵ = 1801781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6720 + ... + 6982.

It is an arithmetic number, because the mean of its divisors is an integer number (133056).

2^1801813 is an apocalyptic number.

1801813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1801813 is a deficient number, since it is larger than the sum of its proper divisors (327083).

1801813 is a wasteful number, since it uses less digits than its factorization.

1801813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 1801813 is about 1342.3162816565. The cubic root of 1801813 is about 121.6848670673.

Adding to 1801813 its reverse (3181081), we get a palindrome (4982894).

The spelling of 1801813 in words is "one million, eight hundred one thousand, eight hundred thirteen".