11871987 has 8 divisors (see below), whose sum is σ = 15912960. Its totient is φ = 7872840.

The previous prime is 11871983. The next prime is 11871989. The reversal of 11871987 is 78917811.

It is a happy number.

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

It is not a de Polignac number, because 11871987 - 2² = 11871983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11871983) 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, 9787 + ... + 10932.

It is an arithmetic number, because the mean of its divisors is an integer number (1989120).

Almost surely, 2^11871987 is an apocalyptic number.

11871987 is a deficient number, since it is larger than the sum of its proper divisors (4040973).

11871987 is a wasteful number, since it uses less digits than its factorization.

11871987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20913.

The product of its digits is 28224, while the sum is 42.

The square root of 11871987 is about 3445.5749883002. The cubic root of 11871987 is about 228.1258346626.

The spelling of 11871987 in words is "eleven million, eight hundred seventy-one thousand, nine hundred eighty-seven".