11805013 has 4 divisors (see below), whose sum is σ = 12878208. Its totient is φ = 10731820.

The previous prime is 11805011. The next prime is 11805019. The reversal of 11805013 is 31050811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11805013 - 2¹ = 11805011 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 (11805011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536581 + ... + 536602.

It is an arithmetic number, because the mean of its divisors is an integer number (3219552).

Almost surely, 2^11805013 is an apocalyptic number.

It is an amenable number.

11805013 is a deficient number, since it is larger than the sum of its proper divisors (1073195).

11805013 is a wasteful number, since it uses less digits than its factorization.

11805013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073194.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 11805013 is about 3435.8424003438. The cubic root of 11805013 is about 227.6960464428.

Adding to 11805013 its reverse (31050811), we get a palindrome (42855824).

The spelling of 11805013 in words is "eleven million, eight hundred five thousand, thirteen".