43550040 has 128 divisors (see below), whose sum is σ = 141004800. Its totient is φ = 10728960.

The previous prime is 43550027. The next prime is 43550041. The reversal of 43550040 is 4005534.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 43549989 and 43550016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43550041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85306 + ... + 85814.

It is an arithmetic number, because the mean of its divisors is an integer number (1101600).

Almost surely, 2^43550040 is an apocalyptic number.

43550040 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 43550040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70502400).

43550040 is an abundant number, since it is smaller than the sum of its proper divisors (97454760).

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

43550040 is a wasteful number, since it uses less digits than its factorization.

43550040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 43550040 is about 6599.2454114088. The cubic root of 43550040 is about 351.8272869988.

Adding to 43550040 its reverse (4005534), we get a palindrome (47555574).

The spelling of 43550040 in words is "forty-three million, five hundred fifty thousand, forty".