1142784 has 78 divisors (see below), whose sum is σ = 3407456. Its totient is φ = 368640.

The previous prime is 1142783. The next prime is 1142789. The reversal of 1142784 is 4872411.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142783) 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 5 ways as a sum of consecutive naturals, for example, 36849 + ... + 36879.

2^1142784 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 1142784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1703728).

1142784 is an abundant number, since it is smaller than the sum of its proper divisors (2264672).

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

1142784 is an equidigital number, since it uses as much as digits as its factorization.

1142784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61 (or 36 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 1142784 is about 1069.0107576634. The cubic root of 1142784 is about 104.5493612334.

It can be divided in two parts, 11427 and 84, that added together give a palindrome (11511).

The spelling of 1142784 in words is "one million, one hundred forty-two thousand, seven hundred eighty-four".