840441 has 16 divisors (see below), whose sum is σ = 1323008. Its totient is φ = 464400.

The previous prime is 840439. The next prime is 840451. The reversal of 840441 is 144048.

It is not a de Polignac number, because 840441 - 2¹ = 840439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6 + ... + 1296.

It is an arithmetic number, because the mean of its divisors is an integer number (82688).

2⁸⁴⁰⁴⁴¹ is an apocalyptic number.

It is an amenable number.

840441 is a deficient number, since it is larger than the sum of its proper divisors (482567).

840441 is a wasteful number, since it uses less digits than its factorization.

840441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 840441 is about 916.7556926466. The cubic root of 840441 is about 94.3703886465.

Adding to 840441 its reverse (144048), we get a palindrome (984489).

The spelling of 840441 in words is "eight hundred forty thousand, four hundred forty-one".