11986213987 has 8 divisors (see below), whose sum is σ = 13845038832. Its totient is φ = 10255584000.

The previous prime is 11986213949. The next prime is 11986213999. The reversal of 11986213987 is 78931268911.

It is a happy number.

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 11986213987 - 2¹⁵ = 11986181219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11986213907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32048514 + ... + 32048887.

It is an arithmetic number, because the mean of its divisors is an integer number (1730629854).

Almost surely, 2^11986213987 is an apocalyptic number.

11986213987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

11986213987 is a deficient number, since it is larger than the sum of its proper divisors (1858824845).

11986213987 is a wasteful number, since it uses less digits than its factorization.

11986213987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64097429.

The product of its digits is 1306368, while the sum is 55.

The spelling of 11986213987 in words is "eleven billion, nine hundred eighty-six million, two hundred thirteen thousand, nine hundred eighty-seven".