2013805 has 4 divisors (see below), whose sum is σ = 2416572. Its totient is φ = 1611040.

The previous prime is 2013787. The next prime is 2013821. The reversal of 2013805 is 5083102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1205604 + 808201 = 1098^2 + 899^2 .

It is not a de Polignac number, because 2013805 - 2¹³ = 2005613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201376 + ... + 201385.

It is an arithmetic number, because the mean of its divisors is an integer number (604143).

2^2013805 is an apocalyptic number.

It is an amenable number.

2013805 is a deficient number, since it is larger than the sum of its proper divisors (402767).

2013805 is an equidigital number, since it uses as much as digits as its factorization.

2013805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402766.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2013805 is about 1419.0859734350. The cubic root of 2013805 is about 126.2813273891.

Adding to 2013805 its reverse (5083102), we get a palindrome (7096907).

The spelling of 2013805 in words is "two million, thirteen thousand, eight hundred five".