1281384 has 72 divisors (see below), whose sum is σ = 3841110. Its totient is φ = 383616.

The previous prime is 1281383. The next prime is 1281389. The reversal of 1281384 is 4831821.

1281384 is a `hidden beast` number, since 1 + 281 + 384 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1258884 + 22500 = 1122^2 + 150^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1281383) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 34614 + ... + 34650.

2^1281384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1920555).

1281384 is an abundant number, since it is smaller than the sum of its proper divisors (2559726).

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

1281384 is a wasteful number, since it uses less digits than its factorization.

1281384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 55 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 1281384 is about 1131.9823320176. The cubic root of 1281384 is about 108.6158234221.

The spelling of 1281384 in words is "one million, two hundred eighty-one thousand, three hundred eighty-four".