1187984 has 20 divisors (see below), whose sum is σ = 2630784. Its totient is φ = 509088.

The previous prime is 1187981. The next prime is 1187993. The reversal of 1187984 is 4897811.

It is a super-2 number, since 2×1187984² = 2822611968512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1187981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5192 + ... + 5415.

2^1187984 is an apocalyptic number.

1187984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1187984 is an abundant number, since it is smaller than the sum of its proper divisors (1442800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1187984 is a wasteful number, since it uses less digits than its factorization.

1187984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10622 (or 10616 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The square root of 1187984 is about 1089.9467876919. The cubic root of 1187984 is about 105.9099745899.

The spelling of 1187984 in words is "one million, one hundred eighty-seven thousand, nine hundred eighty-four".