40445440 has 160 divisors (see below), whose sum is σ = 115689024. Its totient is φ = 13271040.

The previous prime is 40445437. The next prime is 40445443. The reversal of 40445440 is 4454404.

It is an interprime number because it is at equal distance from previous prime (40445437) and next prime (40445443).

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40445443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 663010 + ... + 663070.

Almost surely, 2^40445440 is an apocalyptic number.

40445440 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 40445440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57844512).

40445440 is an abundant number, since it is smaller than the sum of its proper divisors (75243584).

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

40445440 is an equidigital number, since it uses as much as digits as its factorization.

40445440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 40445440 is about 6359.6729475658. The cubic root of 40445440 is about 343.2599920845.

Adding to 40445440 its reverse (4454404), we get a palindrome (44899844).

The spelling of 40445440 in words is "forty million, four hundred forty-five thousand, four hundred forty".