11979815 has 8 divisors (see below), whose sum is σ = 15221520. Its totient is φ = 9020032.

The previous prime is 11979787. The next prime is 11979817. The reversal of 11979815 is 51897911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11979815 - 2⁸ = 11979559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11979817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70385 + ... + 70554.

It is an arithmetic number, because the mean of its divisors is an integer number (1902690).

Almost surely, 2^11979815 is an apocalyptic number.

11979815 is a deficient number, since it is larger than the sum of its proper divisors (3241705).

11979815 is a wasteful number, since it uses less digits than its factorization.

11979815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140961.

The product of its digits is 22680, while the sum is 41.

The square root of 11979815 is about 3461.1869351423. The cubic root of 11979815 is about 228.8144094854.

The spelling of 11979815 in words is "eleven million, nine hundred seventy-nine thousand, eight hundred fifteen".