11967987 has 4 divisors (see below), whose sum is σ = 15957320. Its totient is φ = 7978656.

The previous prime is 11967979. The next prime is 11967997. The reversal of 11967987 is 78976911.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11967987 - 2³ = 11967979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11967937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1994662 + ... + 1994667.

It is an arithmetic number, because the mean of its divisors is an integer number (3989330).

Almost surely, 2^11967987 is an apocalyptic number.

11967987 is a deficient number, since it is larger than the sum of its proper divisors (3989333).

11967987 is an equidigital number, since it uses as much as digits as its factorization.

11967987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989332.

The product of its digits is 190512, while the sum is 48.

The square root of 11967987 is about 3459.4778507746. The cubic root of 11967987 is about 228.7390797737.

The spelling of 11967987 in words is "eleven million, nine hundred sixty-seven thousand, nine hundred eighty-seven".