1311984 has 40 divisors (see below), whose sum is σ = 3767120. Its totient is φ = 437184.

The previous prime is 1311971. The next prime is 1311991. The reversal of 1311984 is 4891131.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1087 + ... + 1950.

It is an arithmetic number, because the mean of its divisors is an integer number (94178).

2^1311984 is an apocalyptic number.

It is an amenable number.

1311984 is an abundant number, since it is smaller than the sum of its proper divisors (2455136).

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

1311984 is a wasteful number, since it uses less digits than its factorization.

1311984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054 (or 3042 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 1311984 is about 1145.4187007379. The cubic root of 1311984 is about 109.4736284776.

It can be divided in two parts, 13119 and 84, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 1311984 in words is "one million, three hundred eleven thousand, nine hundred eighty-four".