11820015 has 24 divisors (see below), whose sum is σ = 21694608. Its totient is φ = 5932800.

The previous prime is 11819993. The next prime is 11820019. The reversal of 11820015 is 51002811.

It is not a de Polignac number, because 11820015 - 2⁷ = 11819887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11820015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11820019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6961 + ... + 8490.

It is an arithmetic number, because the mean of its divisors is an integer number (903942).

Almost surely, 2^11820015 is an apocalyptic number.

11820015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11820015 is a deficient number, since it is larger than the sum of its proper divisors (9874593).

11820015 is a wasteful number, since it uses less digits than its factorization.

11820015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15479 (or 15476 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 11820015 is about 3438.0248690200. The cubic root of 11820015 is about 227.7924588770.

Adding to 11820015 its reverse (51002811), we get a palindrome (62822826).

The spelling of 11820015 in words is "eleven million, eight hundred twenty thousand, fifteen".