40223440 has 80 divisors (see below), whose sum is σ = 97708032. Its totient is φ = 15386112.

The previous prime is 40223431. The next prime is 40223441. The reversal of 40223440 is 4432204.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40223441) 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, 316657 + ... + 316783.

Almost surely, 2^40223440 is an apocalyptic number.

40223440 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 40223440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48854016).

40223440 is an abundant number, since it is smaller than the sum of its proper divisors (57484592).

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

40223440 is a wasteful number, since it uses less digits than its factorization.

40223440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 40223440 is about 6342.1952035553. The cubic root of 40223440 is about 342.6308023315.

Adding to 40223440 its reverse (4432204), we get a palindrome (44655644).

The spelling of 40223440 in words is "forty million, two hundred twenty-three thousand, four hundred forty".