840441240 has 192 divisors, whose sum is σ = 2926497600. Its totient is φ = 208429056.

The previous prime is 840441211. The next prime is 840441241. The reversal of 840441240 is 42144048.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840441241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 543909 + ... + 545451.

It is an arithmetic number, because the mean of its divisors is an integer number (15242175).

Almost surely, 2^840441240 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 840441240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1463248800).

840441240 is an abundant number, since it is smaller than the sum of its proper divisors (2086056360).

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

840441240 is a wasteful number, since it uses less digits than its factorization.

840441240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666 (or 1659 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 840441240 is about 28990.3646061929. The cubic root of 840441240 is about 943.7039762946.

Adding to 840441240 its reverse (42144048), we get a palindrome (882585288).

The spelling of 840441240 in words is "eight hundred forty million, four hundred forty-one thousand, two hundred forty".