1383840 has 108 divisors (see below), whose sum is σ = 4879602. Its totient is φ = 357120.
The previous prime is 1383829. The next prime is 1383853. The reversal of 1383840 is 483831.
It can be written as a sum of positive squares in only one way, i.e., 1245456 + 138384 = 1116^2 + 372^2 .
It is an Ulam number.
It is an unprimeable number.
It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 44625 + ... + 44655.
21383840 is an apocalyptic number.
1383840 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 1383840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2439801).
1383840 is an abundant number, since it is smaller than the sum of its proper divisors (3495762).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1383840 is a wasteful number, since it uses less digits than its factorization.
1383840 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 83 (or 41 counting only the distinct ones).
The product of its (nonzero) digits is 2304, while the sum is 27.
The square root of 1383840 is about 1176.3672895826. The cubic root of 1383840 is about 111.4367984909.
Subtracting from 1383840 its reverse (483831), we obtain a palindrome (900009).
The spelling of 1383840 in words is "one million, three hundred eighty-three thousand, eight hundred forty".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.064 sec. • engine limits •