11820915 has 48 divisors (see below), whose sum is σ = 21621600. Its totient is φ = 5967360.

The previous prime is 11820901. The next prime is 11820947. The reversal of 11820915 is 51902811.

It is not a de Polignac number, because 11820915 - 2⁵ = 11820883 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 79261 + ... + 79409.

It is an arithmetic number, because the mean of its divisors is an integer number (450450).

Almost surely, 2^11820915 is an apocalyptic number.

11820915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11820915 is a deficient number, since it is larger than the sum of its proper divisors (9800685).

11820915 is a wasteful number, since it uses less digits than its factorization.

11820915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 11820915 is about 3438.1557556341. The cubic root of 11820915 is about 227.7982402574.

The spelling of 11820915 in words is "eleven million, eight hundred twenty thousand, nine hundred fifteen".