1183987 has 12 divisors (see below), whose sum is σ = 1400376. Its totient is φ = 997920.

The previous prime is 1183981. The next prime is 1183993. The reversal of 1183987 is 7893811.

It is an interprime number because it is at equal distance from previous prime (1183981) and next prime (1183993).

It is a de Polignac number, because none of the positive numbers 2^k-1183987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1183981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3412 + ... + 3742.

It is an arithmetic number, because the mean of its divisors is an integer number (116698).

2^1183987 is an apocalyptic number.

1183987 is a deficient number, since it is larger than the sum of its proper divisors (216389).

1183987 is an equidigital number, since it uses as much as digits as its factorization.

1183987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418 (or 411 counting only the distinct ones).

The product of its digits is 12096, while the sum is 37.

The square root of 1183987 is about 1088.1116670636. Note that the first 3 decimals coincide. The cubic root of 1183987 is about 105.7910622653.

The spelling of 1183987 in words is "one million, one hundred eighty-three thousand, nine hundred eighty-seven".