43445440 has 56 divisors (see below), whose sum is σ = 104314752. Its totient is φ = 17233920.

The previous prime is 43445431. The next prime is 43445473. The reversal of 43445440 is 4454434.

It is a junction number, because it is equal to n+sod(n) for n = 43445399 and 43445408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43345 + ... + 44335.

Almost surely, 2^43445440 is an apocalyptic number.

43445440 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 43445440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52157376).

43445440 is an abundant number, since it is smaller than the sum of its proper divisors (60869312).

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

43445440 is a wasteful number, since it uses less digits than its factorization.

43445440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145 (or 1135 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 28.

The square root of 43445440 is about 6591.3154984419. The cubic root of 43445440 is about 351.5453841807.

Adding to 43445440 its reverse (4454434), we get a palindrome (47899874).

The spelling of 43445440 in words is "forty-three million, four hundred forty-five thousand, four hundred forty".