841840 has 40 divisors (see below), whose sum is σ = 2075760. Its totient is φ = 316416.

The previous prime is 841801. The next prime is 841849. The reversal of 841840 is 48148.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (841849) by changing a digit.

841840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1051 + ... + 1669.

It is an arithmetic number, because the mean of its divisors is an integer number (51894).

2⁸⁴¹⁸⁴⁰ is an apocalyptic number.

841840 is a gapful number since it is divisible by the number (80) 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 841840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1037880).

841840 is an abundant number, since it is smaller than the sum of its proper divisors (1233920).

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

841840 is a wasteful number, since it uses less digits than its factorization.

841840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 841840 is about 917.5183921862. The cubic root of 841840 is about 94.4227226733.

Adding to 841840 its reverse (48148), we get a palindrome (889988).

It can be divided in two parts, 841 and 840, that added together give a square (1681 = 41²).

The spelling of 841840 in words is "eight hundred forty-one thousand, eight hundred forty".