1384840 has 32 divisors (see below), whose sum is σ = 3159000. Its totient is φ = 546304.

The previous prime is 1384829. The next prime is 1384843. The reversal of 1384840 is 484831.

It can be written as a sum of positive squares in 4 ways, for example, as 715716 + 669124 = 846^2 + 818^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1384799 and 1384808.

It is not an unprimeable number, because it can be changed into a prime (1384843) by changing a digit.

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, 3366 + ... + 3754.

2^1384840 is an apocalyptic number.

1384840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1384840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1579500).

1384840 is an abundant number, since it is smaller than the sum of its proper divisors (1774160).

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

1384840 is a wasteful number, since it uses less digits than its factorization.

1384840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 485 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 1384840 is about 1176.7922501444. The cubic root of 1384840 is about 111.4636344370.

Subtracting from 1384840 its reverse (484831), we obtain a palindrome (900009).

The spelling of 1384840 in words is "one million, three hundred eighty-four thousand, eight hundred forty".