11820071 has 4 divisors (see below), whose sum is σ = 12442200. Its totient is φ = 11197944.

The previous prime is 11820047. The next prime is 11820079. The reversal of 11820071 is 17002811.

11820071 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 11820071 - 2¹⁰ = 11819047 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 (11820079) 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, 311036 + ... + 311073.

It is an arithmetic number, because the mean of its divisors is an integer number (3110550).

Almost surely, 2^11820071 is an apocalyptic number.

11820071 is a deficient number, since it is larger than the sum of its proper divisors (622129).

11820071 is an equidigital number, since it uses as much as digits as its factorization.

11820071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622128.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 11820071 is about 3438.0330132214. The cubic root of 11820071 is about 227.7928186159.

Adding to 11820071 its reverse (17002811), we get a palindrome (28822882).

The spelling of 11820071 in words is "eleven million, eight hundred twenty thousand, seventy-one".