40036440 has 64 divisors (see below), whose sum is σ = 122918400. Its totient is φ = 10426752.

The previous prime is 40036429. The next prime is 40036441. The reversal of 40036440 is 4463004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40036441) by changing a digit.

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, 1281 + ... + 9039.

It is an arithmetic number, because the mean of its divisors is an integer number (1920600).

Almost surely, 2^40036440 is an apocalyptic number.

40036440 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 40036440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61459200).

40036440 is an abundant number, since it is smaller than the sum of its proper divisors (82881960).

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

40036440 is a wasteful number, since it uses less digits than its factorization.

40036440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7816 (or 7812 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 40036440 is about 6327.4354994737. The cubic root of 40036440 is about 342.0990103539.

Adding to 40036440 its reverse (4463004), we get a palindrome (44499444).

The spelling of 40036440 in words is "forty million, thirty-six thousand, four hundred forty".