840024440 has 48 divisors (see below), whose sum is σ = 1957555080. Its totient is φ = 324410240.

The previous prime is 840024413. The next prime is 840024443. The reversal of 840024440 is 44420048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840024443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21155 + ... + 46125.

Almost surely, 2^840024440 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 840024440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (978777540).

840024440 is an abundant number, since it is smaller than the sum of its proper divisors (1117530640).

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

840024440 is a wasteful number, since it uses less digits than its factorization.

840024440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25040 (or 25007 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

The square root of 840024440 is about 28983.1751193688. The cubic root of 840024440 is about 943.5479468032.

Adding to 840024440 its reverse (44420048), we get a palindrome (884444488).

The spelling of 840024440 in words is "eight hundred forty million, twenty-four thousand, four hundred forty".