1186987 has 4 divisors (see below), whose sum is σ = 1249480. Its totient is φ = 1124496.

The previous prime is 1186981. The next prime is 1187003. The reversal of 1186987 is 7896811.

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

It is a de Polignac number, because none of the positive numbers 2^k-1186987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1186981) 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, 31218 + ... + 31255.

It is an arithmetic number, because the mean of its divisors is an integer number (312370).

2^1186987 is an apocalyptic number.

1186987 is a deficient number, since it is larger than the sum of its proper divisors (62493).

1186987 is an equidigital number, since it uses as much as digits as its factorization.

1186987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62492.

The product of its digits is 24192, while the sum is 40.

The square root of 1186987 is about 1089.4893299156. The cubic root of 1186987 is about 105.8803384451.

The spelling of 1186987 in words is "one million, one hundred eighty-six thousand, nine hundred eighty-seven".