11820005 has 4 divisors (see below), whose sum is σ = 14184012. Its totient is φ = 9456000.

The previous prime is 11819993. The next prime is 11820019. The reversal of 11820005 is 50002811.

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 2079364 + 9740641 = 1442^2 + 3121^2 .

It is not a de Polignac number, because 11820005 - 2⁸ = 11819749 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, 1181996 + ... + 1182005.

It is an arithmetic number, because the mean of its divisors is an integer number (3546003).

Almost surely, 2^11820005 is an apocalyptic number.

It is an amenable number.

11820005 is a deficient number, since it is larger than the sum of its proper divisors (2364007).

11820005 is an equidigital number, since it uses as much as digits as its factorization.

11820005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364006.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 11820005 is about 3438.0234146963. The cubic root of 11820005 is about 227.7923946378.

Adding to 11820005 its reverse (50002811), we get a palindrome (61822816).

The spelling of 11820005 in words is "eleven million, eight hundred twenty thousand, five".