440042240 has 72 divisors (see below), whose sum is σ = 1149897168. Its totient is φ = 160010240.

The previous prime is 440042203. The next prime is 440042243. The reversal of 440042240 is 42240044.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (440042243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1547 + ... + 29706.

It is an arithmetic number, because the mean of its divisors is an integer number (15970794).

Almost surely, 2^440042240 is an apocalyptic number.

440042240 is a gapful number since it is divisible by the number (40) 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 440042240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (574948584).

440042240 is an abundant number, since it is smaller than the sum of its proper divisors (709854928).

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

440042240 is a wasteful number, since it uses less digits than its factorization.

440042240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31285 (or 31271 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 440042240 is about 20977.1837957339. The cubic root of 440042240 is about 760.6148302692.

Adding to 440042240 its reverse (42240044), we get a palindrome (482282284).

The spelling of 440042240 in words is "four hundred forty million, forty-two thousand, two hundred forty".