11987915 has 8 divisors (see below), whose sum is σ = 14629680. Its totient is φ = 9427552.

The previous prime is 11987909. The next prime is 11987923. The reversal of 11987915 is 51978911.

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 11987915 - 2²⁰ = 10939339 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20024 + ... + 20613.

It is an arithmetic number, because the mean of its divisors is an integer number (1828710).

Almost surely, 2^11987915 is an apocalyptic number.

11987915 is a deficient number, since it is larger than the sum of its proper divisors (2641765).

11987915 is an equidigital number, since it uses as much as digits as its factorization.

11987915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40701.

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

The square root of 11987915 is about 3462.3568562469. The cubic root of 11987915 is about 228.8659678541.

The spelling of 11987915 in words is "eleven million, nine hundred eighty-seven thousand, nine hundred fifteen".