40440440 has 64 divisors (see below), whose sum is σ = 96033600. Its totient is φ = 15296512.

The previous prime is 40440419. The next prime is 40440451. The reversal of 40440440 is 4404404.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103766 + ... + 104154.

It is an arithmetic number, because the mean of its divisors is an integer number (1500525).

Almost surely, 2^40440440 is an apocalyptic number.

40440440 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 40440440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48016800).

40440440 is an abundant number, since it is smaller than the sum of its proper divisors (55593160).

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

40440440 is a wasteful number, since it uses less digits than its factorization.

40440440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 532 counting only the distinct ones).

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

The square root of 40440440 is about 6359.2798334403. The cubic root of 40440440 is about 343.2458465205.

Adding to 40440440 its reverse (4404404), we get a palindrome (44844844).

The spelling of 40440440 in words is "forty million, four hundred forty thousand, four hundred forty".